I agree with simplicity of operation in a high stress situation. Hit the big button, light comes on in high no matter what. You can argue whether it should be momentary-only or a long-throw clicky. For years, my bedside light was a SF body with a Malkoff (and later, a Veleno) LED head. Exactly one mode, high, and momentary/twist. For me, the light doesn't have to be gun-mountable, since I don't mount my light. It should be robust. I do not blind myself with an >250 lumens light, so disagree that brighter light is a waste or that it necessarily does so ... but my bedside light is <250 lumens. Then again, I'm a civilian, LEOs might get themselves in other situations. In any case, I would never argue against an original SF momentary/twist style interface in general, but for me, I'd only use it in the only situation where I'll have a firearm -- bedside light, in the home.
That said, as long as the primary UI is simple and idiot-proof (or rather, stress-proof), it is absolutely the case -- at least for me -- that other modes can be useful. As a civilian, my use of a flashlight in defensive situations does not (usually won't) involved a firearm. There are certainly defensive situations outside the home (without a firearm, since I can't carry one) where I can use multiple modes, and instant access to strobe is useful. With something like the XT series interface, I have my dead-simple highest-stress interface, and also have other options available for other situations (and I know from experience I can competently use those options).
