its a tossup depending on build.
There's a premium on having a physical immune stone skin so it can't die easily.
Venom lords spread amp with inferno and with holy freeze + stone skin + cursed are immune to everything except amp/decrep (conviction can make cold/light chip them and magic damage is full power but all of those are minor damage sources)
Urdars from act 5 with holy freeze + stone skin + cursed stay physical immune even through amp/decrep and are aggressive and higher than normal damage/regen, but they can't amp small packs or bosses, and they aren't poison immune (~77% resist, but their regen will be disabled). And while venom lords are unbreakable fire immune, urdars being unbreakable phys immune is 100x better for staying alive
Spearwomen with holy freeze + stone skin + cursed hit 99% dr and aren't immune, that means amp/decrep utterly wreck them so they're vulnerable. Higher damage output but very fragile now, and definitely can't tank heralds. And same urdars, are immune to fire/cold/light without conviction, but only 92% poison resist.
Siren is a really iffy call. Its generally the best at spreading amp now, but its erratic AI means it won't tank or deal dps reliably, or even stay in range for blood boil, and even though +damage applies to blood star its damage is dinky. And they only have 91% dr with stone skin / get wrecked by cursed (but immune to fire/cold/light/poison)
Vile mothers have an extra purpose now that their vile children can soak up some hits from heralds. Vile children spawned in a TZ should have 4468 average hp and benefit from bo so maybe ~7.8k hp each. Hell I wonder what demon hp is capped at, because maybe the vile children tank more than the demon. And once that meat shield is up, it becomes a competent aggressive AI melee fighter. I think you'd need to test how well it tanks heralds because those vile children aren't something to write off.
As to above post from a couple weeks ago, WSK1 lancers are just a typo on basin wiki. They aren't 450% hp, it would be extremely obvious when you fight them if they had 2x the hp of a death lord
The wsk version has identical stat scaling to the other lancers in act 5, they just have a % of the monlvl stats, the matron's den version has totally different scaling and only appears in matron's den
Man, I hope the ptr changes get moderated a bit. I get nerfing ES some as it is insane and way outstrips basically every spec except maybe Mosaic, but a good demon build is, in my opinion, about on par with some of the other meta builds in end game, except maybe being a bit too tanky.
Having a summoning class where your summons, which are very difficult to farm, can't
checks notes fight a lot of the enemies in the game, seems like a really poor design choice. Hunting a cool bind down is some of the most fun I have had in d2 in ages, so I am not loving these changes.
What yoy described will also make ubers near impossible on a summoner, while of course a hammerdin with a two skill point investment into smite and fanat will be able to cruise through em with lifetap as always
Also, my understanding is that amp works at full strength, unlike conviction and lower res. There's not the 1/5th penalty after breaking immunities.i believe decrep is the same. I'm fine with that generally as physical classes don't get many breaks as is.