Good software is when both kinds of users are pleased. As Alan Kay said "Simple things should be simple, complex things should be possible.". But it's probably the hardest thing in UX design to make something that is simple and powerful at the same time - most things sadly end up being only one of the two.

I agree, but I didn't say that good software doesn't please its users. I said you generally shouldn't optimize for power users and that software should be usable.