Sacrosanct
Legend
I have to say, I disagree. The fluff can be made to fit any combination (IMO its even more fun to try to make a back-story for a miss-matched race/class/background). But you can't make a optimized character design fit all race/class/background combos.
I'm not sure what you're disagreeing with. I said that if he's putting the primary focus on min/maxing rather than fluff, I can't help because I don't play that way. I didn't say he couldn't have fluff, just that the priority is on the numbers rather than the role-playing part of it. Your statement of "fluff can me made to fit...." doesn't contradict that.
However, that being said, when I think about it, I think that in some circumstances you can't force the fluff to fit with the most min/maxed version. So maybe you preemptively disagreed?

For example, if I want to play a PC who is a half orc, a lone child survivor from a raid and grew up to be a druid of the land in the wilds, that cannot be forced into any of the optimized builds you just posted. In fact, a common response to that would be, "why would you want a half orc? The don't get the stat bonuses for your class and you're not gonna be a front line fighter so you're wasting the half orc abilities."