@XAfricaSaltX
That's the balancing act there. It's an ability to give him a temporary boost to his already excellent running skill.
I'm also a big fan of Battlefield and other FPS games. Realism doesn't always translate to fun. Should every FPS game be realistic like Rainbow 6 where a few bullets drops you? The hardcore fans love that, but I can tell you that a ton of my friends do not enjoy it because they're not skillful enough to last long in the game, nor have the time to commit to getting better. There is "skill curve" where you'll have a lot of players quit after X amount of time when they feel they aren't having fun anymore or feel they just can't compete with everyone else (who likes to lose a mass majority of the time? Some don't mind it, but most do).
I also see a lot of feedback on how everyone is using the Chiefs and Ravens in Online H2H. I have to say, I wish I'd see a lot of more variety in online H2H games myself, but when you have a game like Madden where it's highly competitive where the object of the game is to win, it makes sense everyone is using those two teams because they have highly skilled quarterbacks.
What would happen if Lamar Jackson didn't fumble when tackled like you see in real life? This is where player behavior comes into effect. Players will start to default to running over passing, which is:
A) Not what Lamar Jackson was focused on improving this year (he ran far less)
B) Not what the core QB position is
C) It becomes unbalanced because players are able to pick up an additional 1-3 extra yards every run because they can now dive or get tackled while moving forward with no risk of fumbling it.
My speculation is it will create an environment where the community will then want Lamar Jackson's speed to get turned down to balance it out. But why would you turn down his true speed in game? You'd have to also turn down everyone else's speed too, right? So that's not really a solution.
To sum it all up. He would be too overpowered and the mass majority of games online would be Ravens vs. Ravens.