The Adventures of Duo ADC Bot Lane
Your points about him being objectively worse than other late game carries is pretty subjective. I would put him pretty high up as far as late game carries go. Also, he does fine in the tank meta with the 50% arpen from his ult which is on a very short cd as well as just how efficient of an item botrk is on him. Maybe in the highest level of play there are better champions, sure, but he has a role he can fill on team comps. It may be a unique role, but he has a place in teamcomps. You also don't need to build a team around him if you build him for the splitpush/duel game in which he does very well.
There may be "better" champions that are more versatile at the highest level of play but calling him "shit" is pretty uninformed and close-minded.