In the Windows 3.1 days, it was nearly impossible to make a program that wasn't fully keyboard-usable. Even if you left out all the hotkeys in the menus and messed up the tab order, it was still possible (even if annoying) to get through it with the keyboard, and adding the hotkeys (as well as actual shortcuts) and setting a sensible tab order was super easy and straightforward.
Nowadays more than half of all software is made using non-native GUI toolkits (or sometimes no toolkits at all) that refuse to implement any of the typical keyboard navigation that would previously have come for free.
The keyboard makes computers a joy to use for me. Seeing it disappear makes me very sad. Seeing how the vast majority of people don't care that it disappeared makes me feel like an alien from another planet.