Do they now that they are reducing legroom for regular seats in order to allow their version of MCE? They used to have the largest, I think? 32 inches, wasn't it. AA was 31 (mostly). But I read at some point WN was reducing their main cabin seats to something like 30-31 to allow for extra leg room, also.
Of course, the point is that all the airlines seem to play copycat cut corners. I am petite, and I find the seats cramped, so I cannot fathom how the tall folks handle it sometimes.