The problem I have with Pyke as a Support main

He's feast or famine. From what everyone is saying, they think the way Riot is going to make him go bot is to have low base damage, scaling, and poor wave clear.

Ok, fair enough, then why not build him as a Tank instead? If he has low damage then the logical thing to do is build him as a Tank, right? Well no, his passive converts all of his bonus health into attack damage. Ok, so he has low damage on his abilities but by buying health he instead gets a damage stat that doesn't scale well on him anyway.

So my second to last question is; what does he do if he falls behind? He has no fallback pattern since he cant go tanky and from what i see of his kit, he has no defensive steroids either so he either wins lane and snowballs or loses and becomes useless since hes melee and has to be near the enemy to do his job. It honestly sounds like after lanning phase that he falls off hard compared to other Supports anyway actually.

So why would I, as a Support main, EVER pick Pyke over someone like Leona or Thresh or Rakan who can also make big plays but also have safe fallback patterns when they don't get ahead? Why would I pick Pyke in solo que where I regularly see every other player on my team pick a high damage, low durability, low utility, champ already? I don't understand how he makes Assassin players want to play him since he actually doesn't do that much damage, or make Support players want to play him since getting ahead is so important for him and he has no more utility than a lot of Fighters, Mages, and Tanks. I don't understand how they're trying to sell this champ.