I have been on the ranked grind for a couple of days (granted I’m still in Gold for support and plat for DPS) but there were so many games where no one was in voice chat. I had a couple games were we played with comms as a team and these games tend to be the winning ones.
It’s overwatch, comms is half the game.
lots of people are already probably in discord or something with their duo/trio. also, as others have said, you can convey a lot through pings/preset comms, short of calling out things like CDs and warning for enemy ults.