So the round cube was a hugely helpful primitive for modelling spherical objects with SubD , and when you added it , it would look like this :
Now , when I go to add one in 2.83 , you now get given this absolutely useless mesh that you can make in seconds anyway with a cube and the bevel tool :
Any idea why this madness has happened because I personally would really like the old round cube back.....
WAIT!! All is not lost , I found the old round cube hidden in the presets list here , it has now been renamed as a quadrasphere :