[Illuminated One]

There are two main reasons:

Firstly I'm anoyed with using "out of game" things to have an advantage. Things like reading debug logs to figure out the enemy script or writing lengthy diplomatic texts. Not only does this represent an advantage over people who lack the required skills, it means also that I need to commit extra time (not spent making meaningful decisions/actions) if I want to play competitively. I don't want that, I guess I could farm on an mmorpg instead. So everyone gets a limited time frame, how he uses it is his decision.
Since I was already there I thought we can also make this a very tight schedule and also put a prime focus on the metagame decision of time management. I just hope that wildly sending unscripted armies around doesn't prove a winning strategy.

I don't want to play 6 turns a day because I don't have the time at the moment. I know many people here like fast host times, I couldn't understand slow pace game when I started, too.
Well, if you consider it otoh you have the same amount of ingame time, it's just spread over a longer timespan. Requires more patience and is less demanding.