actually even Tier 10 tanks aren't very safe when a T7(T6 for ussr) arty is around, it happened to me quite often with my M40 that I blasted an IS7 for 2k with a devastating hit to the engine bay if there's anything even left a fire usually breaks and just 1 shots them.
still those are pretty rare usually the 1 shots most people get is just a lucky hit to the ammo rack which can happen from anyone really, I have a friend who 1 shot an is7 with a grille hitting the ammo rack.
anyway I've been fooling around the test server and I don't want to burst your hope bubbles but arty isn't ''nerfed'' adjusted? sure there are some changes here and there but it doesn't hinder much especially if you are a good arty player, even though I play arty don't get me wrong I hate it when I always get targeted in my KT by arty but that's the game tbh it's no different than those huge alpha damage TD's which blast you to Valhalla and back with crazy accuracy and way lower reload... sure they don't shoot it across the map but still they have a higher chance of hitting imo.
I do like this 8.6 update they added some nice things and the gap closer in arty is also nice since I have been grinding for that t92 for ages with like under 50k left although I didn't play a lot, now I can just get that t9 M55 arty instead which seems pretty cool also not that far from an E-75 either