Not exactly saying they're wrong, but like previous I said, I don't agree with the statement "it should be" (as in that's how the OS should be built or how product should be), if you read previous post, and why I started to write and give so many examples.

Um... I started to use Computer during MS-DOS era, 386 I think? But, I'm not very familiar with Lotus 1-2-3, dBase, or Wordstar, but heard of them. That time, mostly play games lah, and also did many problem like issue command to delete all files and suffer the consequences, 

MS Office, I'm not sure what you meant by dumbing down; Did they remove feature, add limitations and restrictions? Or they just make process easier and simplifies things? It's 2 different thing.
Like Camera, it can introduce many Auto & Scene modes in DSLR, so it makes taking photo easier for beginner and starters, but they don't remove manual mode.
What iOS did, is like change the DSLR industry, making super efficient auto-mode so anybody can pickup and use and the pictures turn out nice most of the time, then they remove all the manual modes, features, settings, add in limitation and restrictions (cannot simply transfer files, must go through iTunes).
The is MUCH more beginner and people who just want to take great photo without learning and knowing much, so the product becomes very successful; Does it mean other DSLR make should follow suit? I don't think that's what I want to happen; The public may prefer something simple and easy to use, but it doesn't mean there's need to remove features, add limitations, add restrictions......
Simply put, between (1 - Simple) and (2 - Advance), why choose either one when you can have BOTH?