The 2000s as a whole was a decade of transition into the 2010s, by the end of the decade we left behind most of the 80s-90s things.
There were definitely lots of 90s leftovers up until the mid 2000s.
CRT TVs with VHS still being dominant in 2005, internet 1.0 still
Web 2.0 became mainstream in the mid 2000s, by the time YouTube appeared as well as broadband becoming more accessible. Although some Web 1.0 content lingered until the end of the decade.
There's just something about the 90s that was somehow hard to get rid off.
That's because we've undergone drastic cultural and technological changes in the 2000s. It was the transition to the digital era the way we know it today. The birth of social medias, the death of VHS and Blockbuster, online gaming becoming mainstream. The way we connected with people changed in the 2000s. We've also started to became more aware of social differences and accepting as a result. The were massive political changes across the globe.
The 90s took their sweet time to disappear because it was the last decade before the massive changes the 2000s brought.