Tech is not elderly-friendly
Both my parents, now getting on a bit, have Macbooks. Both of them like the '3 finger drag' gesture because they can move things around one handed, and it must be good because they've actually remembered it, unlike the screen zoom or two-fingers to right click, or.. I could go on.
Anyway, the problem is that, with their now shaky hands and reduced motor control, just moving the pointer around the screen often results in 3 finger dragging happening unintentionally and unobserved. 'I've lost an email folder!' is the latest one - yes, you've accidentally dragged it onto another one. Again...