Like you take those two champions out of the meta or ban them away and people start picking healthier champions.
Sure it's still counter pick heaven with Fiora/Jax/Riven/Kennen/Pantheon and all that stuff, but at least you're not getting stat checked and completely out gunned just because of the way Sion/Urgots kits work and how there base scalings are like. There's room for outplay on healthier champions than Sion and Urgot
Some notable things about Sion/Urgot
Sion: His abilities don't proc minion aggro if he wants to poke you, and in most scenarios goes even or ahead in lane depending on the situation.
Urgot: You just lose if hes running spell book honestly
Edit: Hopefully new conqueror fixes some top lane champion pools, but it might make things worse, who knows