Sampler feedback isn’t really useful. UE already has virtualized texturing in a lot places, already a better solution so there isn’t any obvious reason to use the former.
Software VRS would be nice. Hardare VRS would be almost useless on UE titles with nanite, it works on large “blocks” of identical/almost identical triangles (8x8) and isn’t suppored on PS5. But Software VRS can squeeze down to 2x2 blocks, or even 2x1/1x2 blocks, which are obviously much more likely to happen, especially with Nanite throwing so many triangles at the sceen. As The Coalition (Gears of War guys) already implemented VRS in UE4 I wouldn’t be surprised if like, UE5.2 might see software VRS show up.