Football should be the key to this is that I play hard, they should be banned. But the unique are missing because you have a lot of credit.
I've played 5 games this season, i have only received 5 yellow cards, if you have good players hard tackling will only help you to dominate the midfield, the rest come by itself.
Even more, my rivals received more cards than me, the way that engine works so far, cards only affect those teams that doesn't have the ball, if you can get it an mantain a high possesion rate you'll not receive cards.
And, as many people said before, the chances that you could remove a ban should be really low and you shoul be able to appeal only once, so, if you play mini games well enough you might get that credit for appeal, but if developers make it in exchange of G or energy will be even more accessible.
However, i get your idea, but take a look in some game's stats, you'll see that teams with really high possession rarely get cards, it happens more when both teams has bad players (in my last U-20 match received more cards than the rest of the season), it's not necessarily an oportunity to play dirty, it's just another option to add if the success rate is low.
But it's ok, you have your opinion, i don't sharet it but i respect it.