This tool would have a completely different use case. Often streamers host community games in the lobby (you can’t invite 8 players to matchmaking) and then need to balance the teams. These games are just for fun between friends, there is no ranking involved or points being changed. But there is a need to have balanced teams, otherwise the games are very one-sided.
This feature would simply be a way to speed up the process of hovering over player avatars to get their ratings, thinking about which players should select which teams, typing e.g.
11212221 in the chat box, and waiting for players to select the teams.
There are already external tools that do this (some are even integrated into Twitch bots and accessible through commands in the chat), but nothing can replace the convenience of having it done directly in game. HD and Voobly actually were much better in terms of balancing teams in the lobby, as you could see all player Elos at once (either next to the name in HD or by typing
!ratings into the chat box in Voobly).