So hum... yeah sure you can't get stuck in a group ever again after a minigame. Years late... but nice I guess?
But wait no, you didn't fix it at all, you just made it so ever single player gets disbanded after every single mini game. Everyone, even guildies and premade teams. This is just one more step towards "solo pvp" tbh. You didn't fix anything you just found a lazy way to avoid it.
Honestly I'm not sure what's more annoying, having to log out for 5 mins once in a while (or joining a mini to leave it) or having to reform your team all the goddamn time when pvping. I almost always sign up for minis as a group (even though we may not end up in the same team at least we can be sure we are in the same mini and still have a good time on ts). Even during pvp festival, many like to sign for minis between events so this is going to be a real pain.
IDK, maybe at least make the groups stick like they used to when using tournament mode?