User blog comment:Kashicorn/Event Time (Harrowing, Snowdown, Lunar)/@comment-4434378-20131007015225/@comment-5514182-20131007041204

Well, Dota2's game engine is newer than League's, and the SourceEngine also allows for all of the flexibility in Dota2.

Imagine x2 Mode or OMG Mode in League. Or the ability to control "dummy" champions, refresh cooldowns, and buy a full build for testing/creating new builds (the next blue ezreal).