I like the idea of having a 'standard' format. i think it will really help new players with small collections. I wouldn't mind an overhaul of the deathmatch 25 format, e.g. via bans. But this was the only non-elo format left where i could play a deck with 'low' star count and be sure to meet opponents with the same.
the matchmaking in the tournament rooms is bad enough, i am seriously getting fed up with having a 20* deck and getting opponents that have 18-20* on their hand, and now the only way out of that misery is gone.
I understand why you remove the format, very few players (compared to the other formats) use dm25. And I understand why, the reward in deathmatch is battle points, so why bother with the dm25 format when you can play dm extended and finish twice as many games/gain twice as many points in 20 minutes. But that could be easily resolved by changing the point allocation in dm25 to account for the longer fights (less 1hko/2hko possibilities with low star decks).
Anyways, it is gone, water under the Bridge
. But maybe you could introduce some extended room with a max star count, maybe (daily/weekly) changing star counts, rolling (clans) bans, etc. Just a thought. So I have a place to flee to when I get the next 10* difference opponent in tournament mode.