There’s this wonderful thing called hearthing. With the change to fountain CD, and objective timers, it’s quite hard to actually run out of mana when the time comes if you know how to prepare for it. You brawl, tap the fountain, and the CD will generally be up by next objective.
As a healer, I have zero problems with the middle brawl. It’s only an issue if you fail to kill somebody, AND the enemy has managed to back off and soak, AND no one responds to it, which though happens, isn’t super common.
It’s usually the person who thinks brawls are useless that runs away, where then the brawl suddenly means something because you can now get easier picks off when you outnumber the other team.
It’s also not exactly that hard to brawl for a little, see nothing is happening, and then rotate before too many of the minions die. If you hate supporting your teammates in team fights, you are just playing the wrong role lol.