This is only a ranked playlist suggestion.
If I want to play ranked and am solo, it will typically put me on a team of randoms. When I check the player list it will show 3 or 4 people on the opposing team partied up.
A lot of other games will make this balanced by putting people in lobbies based on how many people are in teams. Hell, even a Pokemon switch game called Unite does this. If 2 people are teamed up and 2 are solo, the opposing team will also have a team of 2 with 2 solo. If you are solo, the chances of the entire lobby being solo is very, very high.
IMO This would be such a huge QoL update.