>What made the PC era work as well as it did was a strong base of power usersNo, power users rarely influenced mainstream adoption of any tech. Apple and the rest didn't become trillion dolar corps by catering to power users. Power users are niche and very picky market not worth catering to if you want to make it big.
What made the "WIntel/IBM" PC gain majority mainstream market share was that is was all open(not to be confused with open source) which allowed everyone, not just power users, but regular users too, and also any HW vendor and SW developer to decide what HW and SW they can develop and sell to users, and what users can install on their system, without the consent or added 30% tax from the original vendor or manufacturer of the system.
It was basically an open bazaar and a cost race to the bottom, where the free market decided the winners and losers based on consumer preference, but there was no global authority to say "I'm not gonna allow your SW/HW to run on the platform we developed". Microsoft or Intel couldn't gatekeep what you installed or ran on the Intel/Windows platform.
Sure, the PC platform had it's own set of issues due to overabundance of cheap low quality HW/SW that caused poor UX, and anti-trust issues from the Windows and Intel monopolies, but it was overall a net benefit due to the open playing field. Can you imagine 3dfx, ATI and Nvidia GPUs not being allowed to run on the PC platform because Intel had a closed PCI standard that only worked with their own GPUs?