Originally Posted by
Mahourai
It can do difficult content well. That's all it needs to do. It doesn't have to provide the exact same experience as the 25-man version just to justify existing.
Also it would definitely be possible to make 10-mans more difficult than 25, either tuning-wise or mechanically. Tuning is just a numbers game, and Blizzard could increase the volume and complexity of mechanics on 10-man commensurate with the increased room to play with. Or, hell, the 10-man room could be made smaller.