Uhm… No? MoP was the expansion they removed teams in.
It’s better than the current. But yes, it has its flaws as well. Which is solved with:
^ that. That solves the problem with people “not being online”, while also providing a similar bonding experience and team creation process like TBC, WotLK and Cata did.
With WotLK often being hailed as the best PvP gameplay experience, period. Which many people fondly remember their teams from. Even to this day.