The high flash on double click from off is probably my second least favorite thing about ZL, but it rarely comes up, situationally I either blink and don't care, or have one second to spare and wait while passing through low onto the medium setting.
My third least favorite thing about ZL is that if I'm quite inebriated, or panicky and lacking in fine motor control, I occasionally, accidentally, turn on high instead of waiting long enough for the intended moonlight mode...
Normally though it's not a problem, and given the logistical constraints of the system, if it's got to have a panic/failure mode, failing to high is likely the better default option rather than say, moonlight, for more people in more situations.