Those factors I posted is an explanation of an injury. Doesn't mean that in every game we'll have an injury.
Like in real football, luck is a part of a game, same here, in t11.

For some things the mechanic should be open and transparent, for others the mystique should remain.
Injuries should be more transparent.
Exactly !
Performance of my players can be affected from a roll dice/good-bad day or what else but the rates of the players should come after specific actions.

We must know exactly how a special ability affects the performance of a player in specific actions (for example, does it give a 20% more to a F-K specialist ? ) , but in a free-kick must be a (small) roll dice.