To the whole community: You guys don't even understand the "normal" bot lane meta anyway. So hush.
Why does your team need an adc?
Sieging turrets and ranged DPS in teamfights.
What's something Support can do to help win a game?
Ward and sweep wards around important objectives.
What should you do in mid/late game with an adc?
Group around them and protect them, because no matter how fed, an adc is always easy to kill.
Now, based on 99% of my games in the last 5 years, most of you don't even understand concepts like "objectives, wards, grouping, peeling, sieging", etc.
So don't be flaming this Nunu guy for trying a strategy when most of you don't even realize LoL HAS a strategy beyond "mindlessly attack the first champion you see".