User blog comment:Warriorkalia/Support Discussion 1/@comment-6664150-20130821062529/@comment-8506165-20130821102444

Bot kill lanes are frustrating to play against but if you can hold out and play the farm game you end up with one team with (either) an underfed AD carry or an underfed bruiser/assassin, and one with a farmed ADC and a support who doesn't need farm to scale into late.

That's the reason the adc/support meta sprang up, not because you can have a healbot on bot lane to buy aura items and wards. Otherwise, yeah, there'd be no real reason for it when other people can get them and you can pump out more damage on bot lane.

Also, junglers love the kill lanes because most of them don't bother warding. Exploit it.