General rules for online games.

Hello everyone. I have a question (maybe it's silly, or maybe I just haven't found the answer yet): why is "Fast Battle – Enabled" set as a required setting in tournament games? After all, battles with neutral creatures are one of the most interesting aspects of the game, and skillfully managing battles with minimal losses is an art! I know that the AI in "Fast Battle" sometimes shows amazing results, especially against archers... but still...