Why are tanks allowed to deal so much damage?

yes you heard me. Those tanks like Garen, Illaoi, Darius, or Yorick. They stay tanky but deal so much fricking damage. When one of them decides to go mid instead, I have no effing clue how to play against their extreme sustain as poking doesnt seem like an option and even in an all in when they are about half health, it still seems like I lose no matter what unless they %%%% up really hard. How the hell do I play against this? Should I just build tanky and be a sitting duck in lane?
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