Wow. I thought it was impossible to watch the original release of star wars. I need to hunt this down.
Your point still stand though, these modern 4k editions are far higher quality.
There's a good chance you watched it on a CRT given that even on a flat panel LCD fom the late 2000s the low vertical resolution was quite noticeable (effectively ~272p, not counting deinterlacing artifacts from it being sourced from a video master). It looked somewhat acceptable in that context but aged very quickly once CRTs started becoming obsolete.