Yes, that's interesting recollection, now that I think of it the late 90s seems like a period of considerable experimentation with user input, e.g. the Microsoft Natural keyboards were somewhat popular, various trackball mice even for desktops, 2/3 button mice with various buttons on the side, trackwheels (lots more combinations that these days), wacom tablets, etc. I guess this stuff is still available, but much more niche now.

I wonder what happened? Maybe since computers are cheaper, more ubiquitous and people might use several (home, work, laptop), it's much less practical to use an exotic setup these days?