Yes, I am thinking vertical and lateral, unlike the BLTouch for example which only works vertically.
I made one a long time ago because I didn’t know you could buy them for a reasonable price. Assuming they were available then.
The software side is still missing a lot, for example probing the center of a circle or correcting for a skewed workpiece, although for hobbyists these are more niche uses, so it’s not really surprising they don’t get much interest.
Mapping an uneven workpiece should be doable with existing features and only requires vertical probing, so a probe like BLTouch would work for engraving on an uneven surface I would think. It is still advantageous to be removable and repeatable, so that use-case also benefits from the kinematic accessory attachment.
The probe combined with kinematic mount is perhaps a solution in search of a problem, but it is a cool solution.