I probably want a different focus every time I use it so not a problem.
But a tail switch can turn itself on when in a pouch or loop.
I bought a Fenix E35 UE and it is a failure due to the poor body switch & no tail switch. The body switch cannot be found in the dark -- cannot feel it, especially in cold weather. Takes too long to fumble with.
The FD20 light has the tail switch, but loses the 1000 Lm burst of the 14440 battery by being designed around AA current. But it fails in the other way the E35UE fails -- if you are going to make a AA light, the barrel needs to be no larger in diameter than the Mini Mag, so it will fit into existing EMT pouches.
I've had a Ripoffs pouch since the 1980's -- same pouch, worn every time I put on long pants:
http://www.ripoffs.com/datasheets/co7/co7.html
If Ripoffs made a pouch the same width as the CO7, with just a slightly larger pouch to fit a 22mm light, I'd switch my MiniMag for one of these two lights. The pouches made for 1" diameter lights are uncomfortably wide overall.
Also, the listed diameter of the barrel is not the maximum diameter -- the tail cap is larger by a couple mm and that makes the difference in fitting into the pouch. The MiniMag is about 18-20mm in diameter.