People dont realize UU is stally af cuz full stall is the only way currently to have an answer for every highly offensive pressure in the tier. (Hera, typhlo, galv, medicham, weavile, absol, magneton, machamp, azumarill ...) Tier is not stally cuz there arent offensive options, its stally cuz there are way too many offensive options and 3 or 4 walls arent enough to deal with them all. Letting stallbreakers roam free in UU wont change a damn thing. It will only lead to 5 wall teams + dugtrio made specifically to trap and kill said wallbreaking mon.