why does Pyke have the highest base armor and magic resistance in the game?

He's meant to be a high risk/reward champion especially since he cannot gain health from items, but this is more of a false lead since he has the highest base armor and magic resist in the game.

Pyke starts the game with the 4th highest base armor (45) and has the highest scaling armor per level (5) meaning that he ends the game with 130 armor, 15 higher than Braum. Pyke also starts with 32 MR, 0.1 lower than 90% of the melee roster, but has 2MR/lvl scaling while every other melee champ has 1.25MR/lvl. Wait, Sej only has 0.75MR/lvl because Riot hates her. And Graves has 1MR/lvl when every other ranged champ has 0.5 because Riot loves him.

Riot why does an AD assassin who is meant to remain squishy have higher base effective health than most of the tanks in the games roster????