Someone suggested it was because the 1990s were the "peak of technology", but a great counterpoint was provided with this link.
Personally, I think technological progress offers us more optionality: you can now use CDs like in the 1990s but you can also stream. You can use terminals but you can also use GUIs.
No one is forced to adopt technology they don't like. We may be unfamiliar with some old technology, but any technology can be very nice and useful if we can take the time to weight the pros and the cons.
You can then mix and match: I like sixels in the terminal, but I prefer Wayland for GUIs. I discover music on streaming sites, but I prefer to buy CDs for the tactile sensation or download FLACs from supraphonline.cz because I don't have to worry I will lose access to some of my past purchases.