I don't know if this already has been suggested; I have tried to find posts about it but failed.
I think it would be really nice if the rating change of each player was displayed on the game results screen (for rated games). See the attached image for a super simple proof of concept where I added the rating change after the player name.
(I didn't play a rated game obviously, so maybe the information already is displayed for rated games and I just haven't noticed it, but then I think it should be displayed more prominently.)
Good suggestion.