I understand where you're coming from but if a player is good then you should consider him and play him in a role where it is the most simple in which case that said player "only has one job". Decisions by itself won't ruin the player and this goes for any other player which you judge simply by a number of attributes. This is why combinations are important and in a very simple tactic even a bad player can play very well. For example when playing in the lower leagues physical stats are very valuable and you could stumble upon a player which has high Accel. + Pace and poor composure, first touch, finishing and he still goes on to be the top goal scorer in the league. Granted he is how say "dumb" but as a manager when you come across such players you need to play to his advantages in turn he is valuable for the team