Making Stats Based on Actual Champion Roles: A Jab at How to Fix Tank Assassins

It doesn't make sense to have the damage of a spiked two-handed sword and the durability of a tank wrapped in duct tape unless the champ was made to be juggernaut-esque. If the champion is someone like Rengar or Akali, that shouldn't be happening. You know how the champions have primary and secondary roles? Why don't we make those roles mean something for once?

Take the roles of assassin (or "slayer," apparently) and fighter that Rengar has. Assassin means he should specialize in speed (movement speed), and fighter means he should specialize in putting the hurt (attack damage, attack speed). If he were to built anything else besides those stats, like armor or health, wouldn't it make sense for them to weigh him down and make him swing a little slower? It would make more sense to build both defense stats and (primary) damage stats on tank fighters like Poppy/fighter tanks like Illaoi/the one mage tank.

Is that to say that squishy melt-your-face champions ought to not be able to build resistances? No, but it is to say that there ought to be a point where their defenses start getting in the way of their weapon. Granted, there are plenty of items that provide stats that both the stats a champion should and shouldn't have, like health and damage, but in whatever case, stats that shouldn't be on the champion should be accordingly diminished at a certain point.

So how about it? Is it feasible to make the roles typed out for the champions have some actual weight in an effort to alleviate the plague of the tank meta (also so that we can stop seeing clickbait videos talking about the next tank assassin)?