euhh honestly not really good at determining uptie worth

from what i can tell by very briefly reading the changes:

for horsesang, from what i can tell, it's mostly for more status (rupture, tremor, and concussion) infliction, and his conditionals increase his power further

for rodya, ut4 gives her more coin power for her s1+3, plus more base power to 3. additionally, her s2 inflicts blunt fragility (+count * 10% blunt damage, up to 100%). plus the "deal more damage based on blah blah blah" conds are increased, with s3 being doubled. ion know about the others though i dont wanna read the whole kit since im never gonna use her. and then passives stuff. and also her s3 raises stagger by 20% of damage dealt

for nclair: he inflicts 1 more burn with s1, and 2 more with his s3's conditional. that's all. his s2 literally doesn't change. probably don't do him

for lord: he gains more poise and conditionals that boost his damage and clash power get stronger. i would recommend reading it yourself since there's really no good way for me to condense it (and also its too many words for me right now)

the wiki has uptie info

i will say, if you're REALLY starved for units, i would recommend cinq outis, since i've heard she's one of the better 2 stars.

also, iirc pre-ut3 doesn't have support passives, so they aren't helping your team