I dislike some of the new computer sculpted designs, they do a lot of fiddly hard edged details that wouldn't have been done by hand.
Perry Miniatures 28mm are still hand designed, they don't go overboard on fiddly details but focus on having a pleasant shape:
Compare that to chunky tempestus scions in plate armor:
Those storm troopers would look better with a simpler breast plate, the details don't add anything for me. Even that "V shape" for where it goes into the crotch, would look better as a simple "_" like the perry minis. The Perry foot knights also have those cool elbow guards of armor, I don't know why but even WHF models tend to lack that detail. I might get my hands on some of those perry minis and try converting them to 40k.
Also a lot of factions are blending together in aesthetic too.
Like... Primaris Rievers skull faces are a lot like Eldar reaper skull faces. Custodes pointy helmets without grills are a lot like Eldar pointy helmets without grills. Eldar fitted hard edged muscle plate body armor is the same as inquisitorial ladies and assassins hard edged muscle plate body armor.
Would like to see Imperium of Man go more gothic plate, Eldar go more Bio Booster Guyver.
Enjoying the Admech stuff though, skitarii, sicarius, and all that. Genestealer cult too, they got that moebius space gear style.