I think the reason for the low quality special edition effects is bc computers back then couldn’t render in 4k. Unless Disney updates them, they’re stuck in the resolution they were made in.
But yeah I noticed the same thing. Part of what makes me stick to D+77/80/83 is the 97 effects just look putrid in the 2019 versions (I prefer to watch oohteedee’s regrades of those versions when watching the OT).
I wouldn’t object to something like adding digital Dewbacks so much if they could look at all like they exist in the same plane of existence.