Concept of pressure
I play Ryze midlane and with his kit I can absorb several ganks, avoid dives, wave clear effectively and attempt to sustain under tower. I do not mind when I get ganked repeatedly. I do not mind if they send 4 people to harass me.
But...
If you're toplane losing 1v1 (some exceptions) or losing a 2v1 then my attempt at absorbing the pressure is not worth it. My efforts are completely useless. If I am being camped and you're not playing aggressively in your lanes or you're not counter jungling or any sort of punishment tactic then you are losing the game for everyone.