I wish they made player growth more dynamic

If my 72 rated, 20 year old striker is scoring 30 goals a season in the premier league, why the hell is he only growing by +3?? It would be amazing if performance actually factored in more to player growth. Not to the point were the game is extremely unbalanced, but to the point were it feels like players are rewarded based on how they perform, not a practically random rating upgrade each season.