Why does Jayce have higher base hp/armor than Jax?

and has a permanent resist buffs in melee mode. I understand Jax ulti gives him resistances. but its not on 0 second CD. it actually costs mana. and there are far more superior version of it. including Nasus that gives HP as well and does damage.

Buff Jax please. or nerf jayce this is nonsense. try to make some sense of your game. one is ranged and one is melee.

you know what I wish I had a gap closer. a disengage and a slow. Max hp damage . some of the most ridiculous damage scalings in league. nonexistent mana costs (after the stupid buffs).