I had one of those Thalmic Myo armbands 12ish years ago. Used it a couple of times and then forgot about it. From memory, there were only a few gestures available to program, and anything I could think to sync them to was just as easily handled with keyboard shortcuts (show desktop, close window, change workspace, etc).
https://www.nature.com/articles/s41586-025-09255-w
yes the Myo was a similar, earlier, and less capable technology also based on EMG sensing.