An issue I’ve run into which is pretty frustrating is playing blitz at your certain elo level, but the person you’re paired up against may be the same for that time frame, but nearly 200-600 points higher in rapid. Obviously more skilled. How are you supposed to gain progress that way? I wish I was truly playing people my level more often than not.
A lot of people are weaker in blitz than rapid. Someone who is consistently 1200 in blitz while at the same time being 1800 in rapid will obviously still be as good at blitz as someone who is 1200 in blitz and 1200 in rapid.