Every dialogue choice that gives combat bonusses or that change a numerical value will push the player to min/max the char, making role playing much harder.
But doesn't it actually helps role-playing character a bit? As in, being on edge / feeling safer when near someone you compete with (a rival) or someone you trust (a friend)?
That's said, as a gamer I never cared much for stats
One rarely needs a perfect / max score to complete the game. But I know a whole lot that do care a lot about that, so I guess I can understand both sides.