Being an older film, it could definitely use some improvement in remastering, particularly for the SFX sections. But Lucas decided to change certain things and insert some previously deleted content. I can't say I minded getting deleted stuff back but you've probably heard of the big controversy over the Han and Greedo scene.

I know that in 2019 when I saw ST: TOS remastered it made me quite happy, because I'd seen some older versions where, for example, there was a semi white box around the Enterprise in all its external shots, making the effects they had really obvious and clunky.