I agree with Sere's post. Reducing AC on last inis and increase them on lower ones seems to be useless. As Sere said , those inis will still be ignore by endgame players. On the release of Orkham , ppl that were runinig it had plenty of AC and reached max amount very quickly but now that we have to farm grafu (that already gave very few amount of AC) for moon artefact we don't get much AC anymore while they're still needed for ammunitions or buff foods craft or even to transform cores for Goldenpull or DC/Orkham pull. I think you should've just let it has it was and in the same time increase AC on older inis so new players could benifit from the change but it wouln't impact endgame players.
I also don't really get the change on buff duration nerf cause as sere said some classes needs to use many skills before really starting to burst. I think about r/wd that has to use 3 buffskills before starting the main combo "Shadowstab --> Lowblow --> Wound Attack" . Consider the fact that you use the Assasin rage while runing to a boss you already lose half of the burst time before you can reach this main combo.
What would be good is that before doing such big changes you should ask for players opinions in a forum thread so you would get arguments for/against such changes that lead you for the final decision. You said in world chat that you talked with some players about this changes before releasing it and they tought it would be good ones but obviously most of the community disagree.
Same thing for class balance. For a moment devs posted pre patch notes changes so people could see the upcoming balance changes that would be made and we could talk with devs about it if it would be a good or bad ones (with arguments). You should have keep doing this in my opinion.
I know that the game need new players and that's a good thing that you guys are trying to help them but you should also hear old players complaints cause they're also needed for the game to be alive.