Does anyone know why alanlog optical switches never gained traction, but analog magnetic ones did? Sounds like optical ones should be cheaper to manufacture, with all the same benefits?
I believe that keys with optical switches are less reliable, being sensitive to things like sensor misalignment or dust.
I have not used any keyboard with optical switches, but several decades ago I have used keyboards with hall sensors, which had a superb quality and reliability, much better than anything that I have used later.
Sadly, I had to abandon the first keyboard that I have used with computers owned by me, which had Hall sensors, because it was not IBM PC compatible (its origin was in some DEC-compatible video terminal and I had used it with a Motorola MC68000 based PC, which I have replaced with a PC/AT clone, for which I had to use a compatible keyboard, of much lower quality).
Otherwise, I am certain that it would have remained perfectly functional until today, unlike the many keyboards that I had to replace since then, when too worn out.