Is Adam Warlock the most difficult hero in the game?

I play both OW and MR and I feel there's no harder character than Adam Warlock in the game

He has a medium hitbox but only has 250hp. I have no idea why he has less hp than invisible woman or luna snow. He has no movement ability too, which means he's a very easy dive target.

He has all healing abilities on cooldowns. I think this is what made the character very hard for me. I've never seen a hero whose all healing abilities were tied to a cooldown. Pick Baptiste or Illari in OW and yes, they have cooldown healing abilities as part of their kit, but it's not their only way of dealing heals.

He shares the ammo of the secondary fire with the primary fire ones (one is a projectile and the other is a hitscan; one deals no headshot, the other does).

He has very impactful but also extremely long cooldowns. It's very hard to play this character in my opinion because on one hand, the cooldowns are very strong when used for your whole team. However, they are also your only survival tool in case you get dived, so in certain scenarios you might want to keep them for yourself to survive.

But most importantly, I think the biggest flaw of the charcater (and the ultimate reason why he's so hard to play for me) is that he has the kit of a poke character but has to play a brawl playstyle to get the most out of his abilities. This makes no sense: his fire power has a lot of range, which makes him a perfect poke support character. However, his healing abilities and ultimate only work when close to his teammates. He lacks the movement, survivability and hp to be a brawl character.

I think the character design is flawed and kind of contradicts itself. I feel like he's the real 5 star difficulty hero of the game. I wish they polished his kit to give him a better direction, whereas it is poke or brawl, one of the two has to prevail. What do you think?