At the time, "Y2K" was just "modern", "contemporary", "futuristic", etc. - but since those definitions change over time, it's useful to give older forms distinct names to differentiate them

Nobody my age (30s) can complain about younger people being fascinated with (or delusional/inaccurate about) 90s-00s media, technology, fashions, aesthetics, etc., since we did the same shit to the 60s-80s