I can probably agree with the brute justice ignoring guard. Heck, maybe it can be a guard buster on top of this (lol). Everything else I'll disagree with.

I haven't played at all this expansion. Yet based off of what I'm reading I can pretty much guess that everyone is diverting bodies towards the middle just to get the train that has the ce supplies, especially in the beginning of the game. This is equivalent to teams rushing dragon the moment they spawn in League of Legends. Whoever loses gets further behind from dying and losing the dragon on top of this. Same thing with Rival Wings. You can lose the huge team fight mid, especially the 50% damage buff active for those who's in the zone grabbing train, respawn, and having to deal with them for a second time with Soaring High stacks between 4 and 10 after 2 to 3 minutes. Nerfing the ce tanks isn't going to do anything as long as everyone is putting a huge value on the train. One team will still walk out with a ton of Soaring High stacks. If you see ahead of time that you're not going to be able to capture mid you're better off either grabbing the small tanks or going as a group to kill the minions. It's 10 for a small tank and 20 if your party manages to kill the minion alone. It's possible get 50 before the first train arrives.

Maybe some things needs a nerf here and there, but for the most part the mode is working as intended like a MOBA. If you die then that person gets stronger. If they've gotten too many kills then the other side is just going to get ran over if they don't have the stacks to combat this. Chasers and Brutes is your friend and your way of catching up. if you're not dealing with a mech focus the big group that doesn't have any chasers or brutes covering them. They'll either back up or feed your team stacks.

If you are going to suggest to take the mercenaries out then I hope you have a suggestion as far as the cave goes. The top balcony can still be used for range players to snipe folks from higher. There will be 0 reason to go in the cave at all.

I can't believe I'm suggesting this, but if most aren't willing to adapt I wonder if towers and core should start attacking players to help with defending from a losing side...