For my current setup with the T1, it's just easier to stick with supers when shooting anything past 50 yards because of drop.
If I went to one of the newer optics that have a reticle marked for supersonic/subsonic 300blk use it would be a different story. With that being said, the shorter range shooting is nice to use subs. Plus, I can load high volume for cheap with supersonic stuff.
Don't think anyone is saying a 220gr bullet moving at 1050fps can't kill just about anything it meets.