User blog comment:QuantumFeint/Botlane meta - where did all the supports go?/@comment-24613667-20140909064430/@comment-4091261-20140909234712

Don't forget the poke lane. You only mentioned two lanes as if you forgotten the second kind of support: the poke support. There are three kinds of supports: kill, poke, sustain. The famous one that this whole blog is adressing is the kill support. What the kill support excels at is, you guessed it, getting kills. Of course every support eventually helps you get kills, but the kill supports let you do so the quickest.

Kill supports excel at destroying sustain. The reason being is that kill supports focus on getting you from 100% health to 0% as soon as possible. This prevents the possibility of multiple heals allowing you to effectively destroy them before they can grow powerful. Kill supports are any of your traditional, non-meta supports. They focus on being like a second aggressive force to take you down.

Don't compare CC to sustain. . What people don't like in a duo lane is sharing. Every single time that happens it's either one person get's fed and the other doesn't, or neither of you get strong at all. That's why it's separated into the support and the supported, it's easier to focus on what you are supposed to do. One must enable fights to happen, the other must grow strong and make sure they secure their position. The most annoying thing about the support getting powerful is if the support actually acts as a negative factor for their ally. Killstealing is one minor way but pushing and even stealing exp by allowing the supported to get hammed and zoned.