Your turning what I said into a badwrongfun statement, which it isn't at all.
I consider creating an effective character a social obligation when you're in a group who all creates effective characters.
If you're in a group who doesn't care about succeeding at their goals and who is happy to have characters die every other session and constantly fail at the challenges presented to them, bully for you.
But in most groups, failing to succeed at the mission or defeat the enemies or being unable to complete the challenges presented to you is the antithesis of fun. So you have one person in a group going against the grain because of... what? Because they want to 'roleplay' a dunce?
Do it in some other group that thinks roleplaying is somehow superior to rolling dice, killing stuff and taking its loot. Where fluffy bunnies are considered dangerous enemies and cats can kill you with one swipe of their vicious claws.
Sorry, sounds very much like a badwrongfun argument to me.
Hate to break it to you(*), but optimization has not even the proverbial rat's behind to do with group survival, challenge or task fullfillment. Those things are entirely dependent on what the DM's decisions are when he sits down to design the encounters in question.
The DM can throw a too-tough encounter at a non-optimized party and kill it off. But it is just as easy to do to an optimized one - it's just a few numbers that differ, and those numbers are entirely at the DM's discretion.
The DM can throw a too-easy encounter at an optimized party and bore everyone terribly. And he can just as easily do that an non-optimized one.
And he can find an encounter that is "just right" for the party - and that is just as easy for a non-optimized party as it is for the optimized one.
It does not matter how many powers and feats you stack in your quest for optimization - the DM can always add a few numbers to the monster stats and simply kill... you... off!
If there is a "social obligation", then it is for the DM to create the right level encounter, no matter how "optimized" or "non-optimized" the party is.
(*) No, not really
