Removing limbs (pre-"death") is fun in RE2R, but it wouldn't fit in RE4R, RE8 or RE9 since they're more action focused with tons of enemies, it would hinder the gameplay if loads of enemies were crawling around. The quieter parts of RE8 and RE9 could have it sure but then it would be weird to switch to get to an action packed part/switch to Leon and then it doesn't happen anymore.
A big part of RE4R and RE9 looking better is just that they didn't fuck up the calibration of SDR and HDR in those games. At least RE3R 90% fixed it.