I agree. There is a lot of alliances with 30-40 active members but 15-30 will be available for war which means you either push for a 30 man and 80% off the time get out matched or people miss out on a 20 man.
But I agree 100%with bringing back 25v25. We just had to drop down to 20v20 because we were a member short on our active roster for 30v30.
I feel the reason for it is that they wanted to speed up War searches, which it does, but it's kind of hampering our ability to let everyone who wants to war do so.