Not in the same league, and not even on the topic, but just found this thread based on your comments about the rotary switches in the HS21 thread, and I figured I will enquire.
There are not that many lights with rotary switches, though I’ve seen, but not used, a few diving lights with such a switch. From the perspective of usability, especially in headlamps, would you comment on what’s possible with rotary switch only?
Would indexing or smooth regulation work better? Are you aware of a rotary dial that you would push in to lock the light and pull to unlock at the off position (or maybe at all positions)? Does the idea of two dials only for the light like HS21 workable? I like dials, I know other people like dials, why there are so few lights with dials?