I don't think that's true
Bringing your main stat up to 20 is pretty clearly a core assumption of the game. Not doing it should only be done for very good reasons. My barb is taking defensive features (infernal con and resil: wis) over offense: he could be sitting on 20 str instead. +2 attack, +2 damage, +2 athletics. My particular character is giving up 7 DPR for those defensive features (49 --> 42)
I mean, he's still functional. Good, even. He can take a beating, he's got great movement, nearly unbeatable grapple check, and hopefully now he can even hit a wisdom save. And yeah, he can even dish out some punishment. My original post was literally a rant; like I knew he was taking on that 5% worse factor, but I didn't expect it to get thrown in my face in such a dramatic fashion in the very first game. Just felt crummy that those were my choices when like...paladins and clerics exist.
10,000%