Great article. I'm not that old, nearing thirty, but I've been around to see most of this. The only ones I didn't experience in any way were Betamax and 3D TVs.
They still used overhead projectors in the 2000s when I was in school. I think it wasn't until I was in high school that I stopped seeing them, probably because my high schools had a higher budget for things like digital projectors.
How did pagers work, anyway? Did they connect to something like cell towers, or were they short range only? My dad had a pager for work, I remember.
I never got to try using a 3D TV in person.
I suspect most people who were around in the late 90s and early 2000s know that old dial-up screech by heart.
Fax machines are still around, of course, but I don't remember my family having one until we got a printer with one built-in in the 2010s, I believe. They're still relevant for businesses, not so much for regular people.