That might be valid, except those are two entirely different type of games. And, grinding out every hero in LoL is going to take a 100 times longer than grinding every car in Forza 5.So do I need to go pull out all your rants to us about grinding in Forza 5 not being an issue and perfectly acceptable and how dare we say any differently?
A moba is a team game (and you can't pick duplicate heros! Hope you're quick or you get stuck with the leftovers). Hamstringing players with a very limited selection of heroes gives those with the better heroes unlocked a huge advantage. Forza doesn't have that, due to class restrictions. Nobody is going to have a unicorn supercar in a C class race.