I didn't even realize how the scoring went in the Dominion.

the endgame triggers once one team has accumulated enough points. For Honor then announces that one army has started to break, and players on the team that’s breaking – the team with the lower score – will no longer respawn after they’re killed. The match ends when the last human player falls, while the defending team can win if the players rally and survive for a set amount of time.

The endgame is heavily weighted in favor of the team that’s on the attack, but it doesn’t affect the balance because both teams start the match on even footing and have plenty of time to establish an advantage. The endgame is therefore a more flavorful way to resolve a match that has already reached its conclusion (in most cases it won’t take the attacking team long to wrap things up). The match concludes when everyone on the defending team is dead. Speaking from experience – we were able to rout our opponents during our demo – that’s a lot more satisfying than watching an arbitrary timer count down to zero.
http://dorkshelf.com/2016/09/16/for-honor-preview/