I don't really get the flashing headlight thing. In two-way traffic, the traffic coming from behind certainly will not see it. Oncoming traffic is separated laterally by a lane of traffic. While they will probably see and notice it, perhaps more so than they would a non-flashing light, to what effect is it in real terms? In my mind, there is no advantage to it, and since I find it annoying, I assume others do as well. My Garmin has a low-brightness non-flashing mode, which is what I use. I am happy to report that in the last 65 years of cycling, I have never been killed, not even once. Many of those years, I was without a headlight in the daytime. 60, IIRC.

I don't like flashing red rear lights, either. It's not that I have any light sensitivity; I simply find them annoying. I do understand that they may have a marginal functional advantage over a non-flashing light.