Team Functions

Get rid of teams being the one exclusive solution to a lot of stuff. seeFriendlyInvisibles, sidebar.team.<color>, friendlyFire, all of that. Since a player can be in only one team, we are forced to make teams to mess around with these options. What if I want mobs to be friendly towards 1 player but he's already in a team? What if I want only 1 player to have access to a scoreboard but he's on a team? What if I want entities visible to everyone but 1 player but they're all already in teams? I want the functionality of a scoreboard only certain players can see without being forced into making a team for it, what about moving setdisplay to players, like how bossbars are player-dependent? What about making AngryAt available on every mob, and making an opposite, FriendlyTo? I don't see a feasible solution to seeFriendlyInvisibles, but the former 2 are enough, I want the funtionality of teams without resorting to teams which takes away other aspects with their limitations, such as each player being restricted to 1 team or team scoreboards depending on color