Why doesn't Cinderhulk give only flat health?

Dear Riot, why don't you just get rid of the % bonus health passive and give flat health instead? If you don't want to make the item too powerful early game, you can simply make it so that it scales with champion's level. For example, you could use a very simple math formula just like this one: F + S * L , where F and S are arbitrary health amounts and L is champion's level.

Buying one of the tank items that give only resistances as a Cinderhulk jungler doesn't feel particularly satisfying, even though they all have great synergies with hp.