We should read between the lines on why the suggestions are made in the first place. I'm speaking purely for 10v10.
1. Make matches shorter 2. Put point/life system
What the real problem in 10v10 is how much of a chore it is to play the rest of the round past the first minute if you are the team that is ahead on the first fight. What mostly happens is you win a fight and someone spawned before you wipe the whole team, so the match lasts the full duration. Then for the next 5min you have to kill people 1 by 1 so they wouldn't regroup. As everyone else mentioned, no one is sad about people making a comeback when they successfully regroup and the other team become complacent on the hunt.
While it is true that for most people, 10v10 is there to farm medals, and less about pvp, I can assure you no one plays the first minute of the match thinking its boring. That part is the 'real' pvp. After that it becomes either a hunt or 'survive and regroup'. That's what creates people just running around endless too.
Just think about it, there are parties that comes to TW that even tho they have no chance of winning the TW, they still would fight for the whole 30min because they can sometimes wipe the enemy team and that feels good. How can people play 30min unwinnable TW with 'fun' pvp but complain about a 6min 10v10 match?
The suggestion about life/point system is a workaround to the idea of the hunt. Because at that point, every kill actually matters.
My Suggestion:
Regrouping is the core issue. You want to eliminate the 'hunt' part of the 10v10. If there is a way to help the 'losing' team regroup easier that would be good (it also helps if they can get wiped as a whole to make the 100% unwinnable matches dont last as long).
2 ways I can think of as a 'fix'. A spawn point where you can group up with your team first before being thrown into the wolves.
example 1, A dies at 5:58, B dies at 5:50, C dies at 5:42, L dies at the end, and they all spawn at 5:30. I'm not sure if together would be better or not, but atleast at the same time.
example 2, you keep the same spawn timer, but add a respawn point. the same thing like TW, but the catch is that everyone gets teleported to the main arena on consistent intervals, but also give them the option to go in right away. Most people who play 10v10 already know and does this, its called THE CORNER. You pray there and hope other team dont find you and your team can regroup.