If someone referred to the "previous decade" in 2004, would you have said the same thing?
As the calendar rolled from 1999 to 2000, we entered a new millennium, century, decade, year, day, ...
Yes, absolutely. I use the largest interval any time I can get away with it!
Every Jan 2 I start saying "last year" and every Dec I say "see you next year"
when you compare tech from 1999 and today, it does feel like new millennium tbh