Has Balance changed so much or is it me?

Hi,
i´m a Casual since Beta and played Season 1 and 2, skipped 3.
Til now i always palyed after the same Pattern.
After leveling at around Level 70 started the corrupted Monos and it worked.
Wasn´t a Breeze but i could go on.
This Season is completely different.
Breezing throuch Campaign and the Monos it ends almost immediately entering corrupted Monos.
Resis are maxed,i´m critimmun but still fall like a Feather in the Wind.
Only Thing i noticed, all my Chars are low on Life, around 1600-1800.
Remembering prior Seasons i was at around 2300-2700.
But is this the only Problem?
Tried 5 different Chars, Minionnekro, Warpath Voidknight, Bleed-Hammerdin, Bear/Crow-Beastmaster.
No Difference in Survivability.
Although it´s not my Class i started a Rogue.
Went Bladedancer with Shuriken and…Jesus.
Not only does he do insane Damage, it seems even more tanky than all my other Chars.
No Problems in corrupted Monos at all.
So is it me not understanding maybe some new Mechanics ? Just absolutely don´t understand why i run into this Wall.
Maybe you Guys have some Tipps for me.

I play Acolyte only, so I can’t comment on your particular experience. However, more and more builds appear to be heavily dependent on very specific gear or a gimmick, which makes them unplayable even with a slight deviation. While I love aRPGs, this issue is my pet pieve in all of them.

Playing Warpath and I have full 1LP w/ corruption, max res, and 3300 life. I could play with ease at 300, had to be careful at 500, and at 750 corruption there are just a ton of things that can clip me and I get one-shot. With better gear not dropping(prophecies) and imprints never proc’ing(on a T7/T6 exalt) I don’t see a way forward.