Why should inting sion even be viable??

so im a mid plat player, nothing special so take this as just my perspective. I cant speak for higher elos but im struggling to understand how the game has got to this point. Literally running it down top lane as sion into a good scaling champion such as Jax or GP is now viable. His trading in the early game with his q damage and grasp procs are bad enough but now he is a tank who builds full ad, gets his scaling health. Gets a steraks which gives him 2k hp or some crazy amount and just autos a tower until he dies and repeats the process with his passive. He also for some reason gets demolish which means he is guaranteed to chunk the tower. What really annoys me is he can be going 0-8, he is worth 0 gold but requires multiple people to stop before he just sieges your entire base. So while he is getting gold for his team, my team is getting 50 gold from his death. The shutdown system makes this even worse. lets say im a gp and I kill sion twice once he is 0-5. i have gained 100 gold but when their team kill me they get 450 from the shutdown?????? Its pretty obvious this is just ridiculous. i understand the shutdown system is in place to encourage people they can come back but if you are getting 4.5x the gold than the other team for trading 1 for 2??? COME ON??

What will happen in season 9 where towers give even more gold (granted will take longer to take). Too much damage in the game in my opinion. Laning phase in the top lane just isnt fun vs tanks and surely thats what the game is about. Just a rant but it really angers me the state of the game since i used to enjoy it a lot.