Magic items. Without them, you get best gear by level 3-4 and then you are stuck with what you have for the rest of the game. I played and ran games without feats and it was ok, even with feats, most people still took ASI over them. Since most games end at about level 10, you get 2, maybe 3 ASI/feats ( 4 as variant human fighter). Multiclassing is also not that big of a deal since 5e introduced subclasses that add extra flavour. I'm somewhat restrictive about multiclassing in the first place ( except for one-two shot beer&pretzel games, then it's no holds bared).