The iPhone is like a pocket Porsche -- it comes in iconic, arguably artistic designs like a Porsche. The difference is that it's affordable to a lot more people. Artistic, iconic design leads to strong brand value and purchase decisions driven not just driven by rational, functional needs but also by irrational wants (desire, lust, envy, communicating status, etc.). Some consumer products have an inherent artistic element that goes beyond purely functional needs: cars, smartphones, fashion, furniture, and so on. Conversely, some consumer products are almost entirely functional in nature -- people buy or use them because of functional needs, not because of irrational wants. Some examples of purely functional products/services might be: hard drives (Christensen's famous example from The Innovator's Dilemma), backhoes, commodities like steel or glass, Internet search engines, and artificial intelligence.
If you're selling a purely functional product, Christensen's "good enough" concept is particularly important. That's because irrational wants don't come into play, and the buyer can easily determine what's good enough by comparing the product's functional, measurable performance attributes with the particular job the buyer needs to get done. So a buyer can look at a hard drive, for example, examine its data retrieval rate and storage capacity, and compare that to his functional needs -- how he'll be using the computer and how many photos, videos, and documents he needs to store -- to determine whether the hard drive is good enough or whether it overserves.
As noted in other posts, the best way to keep functional product elements from overserving is to make sure improvements are meaningful and actually used by buyers.
Another great way to prevent functional overserving is through technological leaps that change consumer expectations of what's good enough. This happens when a company comes up with a breakthrough product that makes consumers think that existing alternatives -- that consumers previously felt were good enough -- aren't good enough anymore. The consumer's perception of what's good enough isn't static: it's relative and changing depending on the latest breakthroughs and what's available in the marketplace.
If a sustaining technological leap or breakthrough creates a large enough performance gap between the breakthrough product and existing incumbent alternatives, it may allow the entrant to establish the beachhead needed to effectively enter an existing market. An entrant with a sustaining improvement/innovation normally doesn't do well because incumbents respond vigorously. The exception may be an entrant with a surprise breakthrough product that catches incumbents off-guard -- you could argue the original iPhone succeeded this way.
Two challenges for an entrant with a breakthrough product may be: (1) the lack of a recognized, trusted brand; and (2) ramping up manufacturing, distribution, and marketing fast enough to take full advantage of the sales opportunity. Incumbents are highly motivated to "fast follow" the entrant's breakthrough product with similar products. The key question here is whether incumbents can quickly acquire the capabilities needed to compete with the breakthrough. In the original iPhone's case, Blackberry and Nokia were unable to fast follow the iPhone with similar products because they lacked Apple's integrated hardware and software capabilities. As a result Apple had the time needed to ramp up iPhone production and distribution. Apple's strong brand also helped.
Returning to this post's original subject, a person buying a Porsche or an iPhone -- or any other product with an inherent artistic element -- considers (1) functional needs but is also influenced by (2) irrational wants like the desire/lust for something beautiful. The good enough standard is highly relevant to the functional needs part, but may not be very relevant to the irrational wants part. And irrational wants become even more of a factor when the product is distinguished by iconic, artistic design. So a product with an artistic element may overserve a buyer's functional needs but still be something the buyer wants to purchase because of irrational wants -- a Porsche or a Ferrari is a good example of this.
You could almost look at a product on a sliding scale: as a product's artistic/iconic elements go up, the relevance of what's good enough -- and the danger of overserving -- go down. The ideal situation may be a product with improving artistic elements and improving functional elements: the key here is that functional elements must improve in a meaningful way that's valued by consumers (to prevent unused, overserving features that actually end up degrading functional performance and ease of use).
Applying another Christensen concept, when the buyer's "job-to-be-done" encompasses purely functional needs, overserving is a greater risk. When the buyer's job-to-be-done is broad, encompassing both functional needs and irrational wants, there's less danger of overserving.
Art vs. Algorithms
Industrial design sometimes rises to the level of art, and art doesn't commoditize. Artistic design creates tremendous brand value and is very hard to copy, and close copies are never valued as highly as the original. Examples of companies producing iconic products and industrial art include Braun, Ferrari, Porsche, Apple, and Tesla. Industrial art has driven the brand value of each of these companies.
Conversely, algorithms and machine learning methods can be copied, and the copy is valued just as highly as the original because the product's appeal is based purely on functional needs. Much of the theory behind algorithms comes from educational institutions and is in the public domain. As noted above, Christensen's good enough concept -- and the danger of overserving -- is much more relevant with purely functional products.
So if you're an investor, it seems to make sense to invest in companies that make products that aren't purely functional. The ideal situation may be a company that makes a product with artistic elements, and that is committed to iconic design. This kind of business model is (1) hard for competitors to copy and (2) reduces the danger of creating an overserving product (since buyers in this kind of market are driven by both functional needs and irrational wants).
This post has been amended since it was first written.
The author owns stock shares of Apple.