Czar nerf: I honestly didn't notice.
Commander double gun: It was lame at first, but long term I agree with it. Being able to fart out the first step of the upgrade very quickly helps a lot in the beginning.
Chrono nerf: I don't like the range being tied to your main gun range, but at least you get a 3k health boost. Not what I want but I can work with it.
Mercy nerf: Yeah, they have to hit the drawing board with that one again. Keep trying guys, every version gives insight.
GC nerfed: GC is still a terror on the field, I haven't noticed a huge impact on effectiveness.
Sniper nerf: I don't like it either, but I understand it. I just use less of them and more T3 mobile artillery and Harbingers.
For the other notes, T1 is a nightmare yes, their T1 bombers are alright, their T2 land is great, T2 air is weird and T2 water is awesome, Harbingers do not square up against bricks and percivals well and you should be handling that differently. Harbingers do well against Titans, Loyalists and Othuums to an extent, this is also where snipers come in to soften targets.
I understand, I'm not saying you're wrong.