Mainly the true damage part. Also tanks have a hard time itemizing against magic if they dont have any magic scaling. The only "tank" that doesn't have that issue is Galio, who is pretty much anti-mage as a statue. Stuff like Conqueror needs to be reworked (Maybe halve the TDC for IE to 5% instead of 10%). Tanks can't do their job because all this true damage exists, and as much as they want to be the frontline, the frontline they are just gets blown to bits. Nowadays its about "Whos got more damage and less brainless people than the other team", which invites stagnation in the ladder because not everyone can play this "carry" role. I can do it decently, but my playstyle is more teamplay centered stuff like Maokai and Ornn. Sure, Sion exists, but he's the ONLY tank top that can hold the fort.