Yeah I have the same issue. I have played football (soccer in Australia) from under 5's to my late 20's and it was ALWAYS illegal to tackle from directly behind.
The rules have relaxed slightly over the years and NOW most tackles are allowed with the current stipulation by the referee for illegal tackles"
"An illegal tackle in soccer is any tackle that the referee judges to be reckless, careless, or using excessive force."
Now given the rule above is stipulated by FIFA, almost 80% of the tackles from behind and probably 50% of tackles from the side in EA FC 24 would be considered "using excessive force".
Even when my players are pushed over, tripped or shouldered away from the ball there is NO foul given.
I'm fairly certain EA have never watched or played a game of football in their life, if they had someone would have said "hey do you think it's normal for players to run at 100% and constantly press without losing any energy or speed?". lol