I respect that some people consider a tailswitch an advantage for its ability to create a Last Mode Memory
agree there is a standby drain with no switch, but have never found it to have any impact in actual use
agree the tailswitch provides the option to turn the dial all the way up, before switching on… this supports the Tactical market (RRT=Rapid Response Tactical)
however, imo, I can turn the dial up on a no button Rotary very quickly if I desire so… I dont think a button makes that faster, in fact, imo, the opposite because
a tailswitch Requires using more than one hold to operate the light
when I draw my switchless RRT-01, my hand is already on the dial, I can dial up, dial down, and reclip to pocket, faster than if operating a tailbutton is required
with a button, there are mental processes to consider… such as, where did I set the dial last time, and how do I need to hold the light to both turn it on, and select a suitable brightness.
with no button, the operation is entirely intuitive, no need to remember where the dial is set, no need to use a grip that allows manipulating both a switch and a dial, simultaneously or otherwise…
just my perspective, Im happy for anyone to experience the joy of Stepless Rotary UI, button or not