You only hit a straight ball by accident. The ball is going to move right or left every time you hit it, so you had better make it go one way or the other.
Certainly, if you can't manage your game, you can't play tournament golf. You continually have to ask yourself what club to play, where to aim it, whether to accept a safe par or to try to go for a birdie. You can't play every hole the same way. I never could.