The new version stress "rebalance" is more buggy and messy than previous (44.09). Dwarves are impossible to bring down to low stress levels (you can make their dream come true, give them the best meals, bedrooms etc etc doesnt work) once they get stressed. If they are in the military they will soon stop caring about their friends dying (doesnt care about seeing a dwarf die) but they will be horrified and get PTSD from seeing a random crundle die. The tactic from the past where you wanted to get the "doesnt care about anything anymore" trait doesnt really work anymore as that seems random now (I like it this way actually). So sometimes they get ptsd sometimes not, but it seems that it is creature specific and checks whether they knew each other (was friends/family etc). Microing corpse haulers is a thing now. The problem is even if you get your "hardened" military to haul corpses, they still get ptsd from it, there seems to be no way to harden them anymore (speaking from my exp from a sinister reanimating embark a few years in). Also there is no "immediate" happines so once someone gets horrified they keep remembering and even if they craft an artifact or masterwork theyre not even happy for a week or a day, so theres no short term happines anymore, just short and long term stress, which sucks and is not realistic. Dwarves should be able to kinda "forget" about problems when they drink for instance, thats my 2p (look at this for instance
https://puu.sh/Ah8V4/2d91eb6fa3.png ).
Essentially what happens now is there is no more "1 drop over the top" tantrum spirals where shit hits the fan and its all over; now it happens slower, 1 dwarf gets too stressed, goes melancholic or whatever terminal thing, dies, this tips someone else (or more) and this repeats and eventually most of your fort is dead (considering no migrants). Although it seems that dwarves that crafted artifacts still cant go terminal like in previous versions so theres that. TBH to this day I dont see what the whole stress change actually "changed" from the previous happiness system, or how it is better or whatever in any way shape or form. Think of this what you will.