it feels like there are people out there who believe they are required by 5e to build purely for maximum possible strength/power just to survive. The example given in the other thread: If you were a fighter 4, and your wizard friend started encouraging your interest in magic, would you take a level of wizard before getting that "precious" extra attack from fighter 5? That's the key issue here. Do you feel like you *need* that extra attack before you would consider broadening your horizons resulting from story development?
To me, the obvious underlying impetus seems to be one of make it through each adventuring day. This is where I think I have a certain small degree of disconnect with some people. 5e seems generally pretty forgiving of the minor power level discrepancies between characters (and, yes, in the grand scheme of things I think power level discrepancies between PCs aren't all that extreme). It can handle a non-optimized PC just fine, IMX. A character that isn't optimization-focused still generally manages to get through the adventuring day to enjoy the next. Is that not true? And isn't that the point? To win the day? I just see non-optimized PCs manage it all the time.
That isn't to say weak characters are immune from death. But neither are solidly built ones. I'm saying 5e's assumed power levels of play has a margin of probability, of either kind of PC dying, smaller than some might think.