Earlier quoted context omitted.
Many regular users beg to differ. At least, in my experience, the people who are less familiar with computers are the ones that love the new features the most. Especially launchpad and such. Also, just curious, but what about Lion / Mountain lion disqualifies it from being a "true" desktop OS?
The 90s seem like they would have been a good time to worry about users who don't really know what computers are. Why are we now driving for that market when everyone under the age of 30 grew up using modern computers? Are we still gunning from the mostly imaginary "grandmother who doesn't know how to use computers" market? The market that 1) is only shrinking, if indeed it ever existed and 2) presumably doesn't buy…
Power users might not like some of the changes, but it's easy to provide them with advanced setting options to change them back (like scrolling or Gatekeeper)--or build the new features in such a way that they're easily ignored (like Launch Pad).