The likelihood of spawn camping goes way way down when a third team is involved. You don't have to Imagine having to watch your back the entire time you are camping a team spawn point because you remember that from the three team format.

Also...

The impact of broken cross healing goes down by half when a third team is involved because you will always have the potential for twice as much damage coming in than you can heal through. This does not exist in XvX.

Also...

There should always be an odd number of objectives in the capture the flag modes otherwise each team can just camp one flag or they go back and forth like a dog chasing their tail. That's not pvp, it's an obstacle course simulator. I guess that's fun if you're into that.

I do not know if zos has contracted with any of the player base to be alpha/beta testers and to provide constructive feedback. I can't imagine they do, but if they do they may want to expand that population to get a more representative sample of player feedback and sentiment. This was not a good change to the game.