PCs who are good at everything
This doesn't make sense to me, for two reasons.
First, 4e PCs aren't good at everything. All are good at some things. Many are good at several things. None that I've seen or heard of are good at everything. (Maybe Arcana-check wizards come closest.)
Second, suppose that 4e PCs
were good at everything - why would that inhibit roleplaying? Rick in Casablanca is, as far as I can tell, good at everything. And is a very compelling character. The X-Men are all good at everything, or nearly everything - and they are intereseting characters who sustain many many multi-protagonist stories. Why wouldn't a 4e group be the same?
huge difference between PCs and the rest of the world, "you don't need what you don't kill" world design and level scaling obstacles.
Didn't we already do level scaling in another recent thread? (Or this one, even.)
HeroQuest revised, Robin Laws' famous game of narrativist roleplaying - arguably the poster child for narrativist roleplaying - has scaling obstacles. Scaling obstacles don't get in the way of roleplaying - they facilitiate it, because they make the focus of play not
operation and mechanical advantage (how can I get my bonus big enough to beat this DC?) but rather
what am I going to do to overcome this challenge which I, as a player, know to be within the mathematical capabilities of my PC if only I'm prepared to do what it takes.
I don't object to your simulationist preferences, but I don't understand why you keep insisting that those who play non-simulationist games can't be roleplayigng. I honestly think it would help you to become a bit more familiar with some RPGs other than D&D, GURPS, HERO and their surrogates.