Why? I'd think something with smooth color gradients and sharp borders would be the easiest thing to upscale.
Because none of the morph VFX are on the original film takes. Ira talked about this during the making of the DS9 doc. IIRC they were all done at video resolution after filming.
Redoing the CGI of the ship battles wasn't hard, because they found the original files, and they were entirely CGI shots. But any shot which is composed of VFX layered upon film would have to have new effects created.
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