Dude, the whole job of software is to "hide messy reality from the user", otherwise the user would still be doing everything by hand. We have a fantastic device that can do many millions of things faster than a human can do one. Don't get me wrong, Apple certainly errs on the side of over simplification and preventing power users from configuring what they want. But building in systems that permit users to avoid worrying about external(to them) complexities is nearly the whole point of what we do.
I also disagree with your statement that the "fallacy of equating an assumed incomprehensible complexity with uneeded complexity is what's killing growth in technology". On the other hand, I totally agree with your subsequent statements surrounding what Developers *should do*, however I see no evidence of the drain on growth in the market.
If there is a market (money) need for the power user UI, the market will eventually produce it barring severe ongoing shortage of qualified engineers. When there is a shortage of workers, they will pick to work on either the most exciting, or the most profitable targets.
Power-User UI is what you expect from internal tools. The software industry's infancy was basically *internal tools* packaged and dumped into the market. The fact that power-user UIs are disappearing (are they? -- at least in relative concentration vs simpleton UI) is a symptom of the maturation of the software industry, for maximizing breadth of reach. The unnecessary sharp edges of Power tools are what gets polished and removed as various products improve.
Physical analogy: Circular saws usually have a finger guard around the blade these days. The finger guard does sometimes get in the way of work. Is this a sign that the tool has been dumbed down? Or that the design was polished for market appeal? Internal tools get the job done at the expense of such polish. Published tools in a mature industry have exactly the sharp edges they need for the people they are selling to.