They had this grand plan to make "Standard/Extented" division and dynamic matchmaker to make up simple play.
That failed horrendously, so they ended up having the "Standard plan" bred with oldschool formats creating halfbreed result that eclitically combines features from both world, creating artificial and untintuitive diversity in gamemodes.
Namely: They tried to change it all the wrong way and ended up making patch on top of patched patch. Thats why there is little bit of everything and they dont want to try to change stuff anymore since its not "totally broken" now
We have KIND OF T1 in this game, its just implemented in numerous ways.
In DT we have matchmaker and scoring rules that do about the same thing, except you can position yourself to have advantage with better cards, but you have to win more streaks to make up for the point loss. If you want to play T1 deck here it actually has no drawback in doing so, and the lowest bracket average is set to 25*; you will meet higher star decks but you will get more points playing against them....
Deathmatch has 25* formats making it same as original T1
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