I saw this the other day too and it looks really cool for screwing around and seeing how different variables affect things but I’m not sure how useful it is from a more permanent perspective.
Most of the less-terrible stepper drivers already support that out of the box. Trinamic stepper drivers, which are particularly popular in 3D printers, use back-EMF for both stall detection (StallGuard) and to optimize motor current (CoolStep).
Those signals can be fed back to the controller and trigger say an E-stop or be used for sensorless homing.
I have TMC5160s on my Nomad, though I haven’t been bothered to tune the StallGuard/CoolStep parameters just yet, I hate the noise it makes when I crash into stuff…