There are several reasons for this limit. The main ones are server stability and balance. To be fair, 25 mobs are quite a lot to run into by accident.
Huge pulls can cause server lag and more importantly disturb other players. They also grant an unbalanced exp rate. These are the main reasons. I understand it can be frustrating sometimes (we apologize for that) but again, running into 25 mobs is not that easy unless someone is training a whole zone away and in that case, the teleportation to a safe location might come handy anyway.
