if you pull ahead of yasuo get defense

As you reach closer to the end of the game you will begin to equalize and your previous advantages and snowballing will not make you magically tankier than normal. Don't be a dumb fuck, do the math. Its very simple.

If you would normally be squishy and a champ goes 0/100000000000000/0 and everyone hits level 17 or 18 then your advantages aren't going to mean much if your hp bar is still within his reach.

If you are fed and you build and then some 0/110000/0 chump manages to last hit you, not only are you going to give him a bounty, he's going to get bonus gold and experience on top of this.

Once you hit 18 and 6 items you aren't going to get much stronger. The more time you waste and the bigger the bounty on your head the stupider you're going to look when you feed.

A 100/10/0 player who gets 10 kills between each death has actually given the enemy more gold than a player who is 0/10/0. The harder you carry the more risk you take, stop whining about how champs come back from too far behind. Too far behind is a destroyed nexus. Everything else is just failure.