But, just wanted to share that I was similarly surprised to land on mouse keys as a preference. I tried most of the UHK modules which were also pretty good and have since tried various other trackballs and pads, but since trying UHK mouse keys, they're what I keep coming back to most, even since switching to new keyboards.
One issue I have with mouse keys is fear of using them in front of others though: every so often, if I need to click something particularly small and don't have a keyboard shortcut memorised (vscode panel resizing is one) it can sometimes take me a fair few embarrassing seconds drawing small squares around my target before I resort to actual mouse hardware.
For the amount of time and thought and effort people have put into alternative mice, I feel mouse keys are massively overlooked and probably have a lot of room for software/firmware innovation without hardware costs.
For original trackpoints, it's basically a stick in the middle of an up/down/left/right resistive strain gauge.
For the ploopy beans here, they use hall effect sensors instead of resistive strain to get a bit more movement.
As soon as you have non-binary up/down/left/right values, the mouse direction and speed can be interpolated to so many values that mousekey accidental squares become impossible.
As a sidenote, I love my UHK. Just a joy to use, and it's so easy to customize. I don't have any experience with competitors like the ZSA Voyager, but the UHK's configuration software and macro language do make it quite pleasant to bend to your will. For instance, I do some funky stuff with macros and lighting here: https://www.cgl.sh/blog/posts/wnl.html