User blog comment:Poisonshark/PS's "Mysteries of Laning Conventions"/@comment-24590723-20140808190928

Nice question.

1. Long lane is dangerous. You need to have some kind of escape. That's why most of toppers are tanky champions with dash/speed and sustain - Renekton is extreme example of that. Second long lane - bot is occupied by 2 champions, preferably ranged, with ways to help each other. But you can pick Ez/Vayne/Caitlyn to top, Quinn and Jayce are even reconsidered good toppers. They have theirs escapes and damage.

2. Mid lane is safe, because you are near turret. That's why you can go there with squishy champion without escape. Another way he can face many problems when played on long (bot/top) lane against competent jungler.

3. Solo lane gives more xp! Then, ADC doesn't need solo lane, because his strength comes from items. Opposite, casters on mid or toppers need to have fast ultimate and they depend on skill more then items.

You can try another meta, but current 1/1/2+1 meta is supported by Riot and was invented after long time of experiments. Other MOBA games have more way to play. Ex. DotA prefers no jungle with pro matches going even like 1/3/1, Strife most games are played 2/2/1. BTW. look at the pro matches, there were some like 1/1/1+2 with double-jungle or 0/1/3+1 with lane swap.