Makes me wonder if the generic servos of the described kind are really close enough to the performance a cheap-class servo can have, or if modern advances in mo

Makes me wonder if the generic servos of the described kind are really close enough to the performance a cheap-class servo can have, or if modern advances in monolithic power stage ICs could allow a servo free of sliding movement (no brushes, no wiper potentiometer (maybe a capacitively coupled differential sensing of angle, or the tricks of the cheap digital calipers with their iirc nonius-like scale read through several parallel tracks of non-touching capacitive electrodes?), instead just a clever chip digitally controlling a brushless electric machine using the feedback sensing available to it). Being able to run an even just very simple digital controller allows things like severely dropping negative feedback gain at a resonance frequency of the larger system. And so much more.