That's all fine if all you care about is combat. For some people, having a PC other than a rogue or bard that can contribute outside of combat also matters. A wilderness fighter who knows how to survive the wilds wants a decent [edit]Oh I didn't say you had to run maxed scores.
I said that in 4e, if you didn't follow the threadmill, combats would get very grindy. The monsters wouldn't suddenly kill you. It would just take forever to finish an encounter with unoptimized PCs..
Something similar happens in 5e. The threadmill is just slower. The game assumes some sort of powergaming to prevent slog. If you may a 15 primary character and pickup flavor feats and boost tertiary scores, you are adding to the slog in combat. If many people in you party do this, your combats will be very long. Longer than the designers intended.
There is no one true way to play the game. There are all sorts of things to consider, especially if using point buy when building a PC other than DPR.
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