One other advantage (for the maker, not necessarily the owner) is that a single switch can do multiple things, like act as a toggle between functions when pushed while being an on/off when held.
If I could change anything on LED tail lights, I'd eliminate the need to turn it off, with a vibration detector that turns it off in inactive for 10 minutes. I'd leave the off switch function for those who wanted it, but my way you don't need to turn it off, and can't forget to either.
BTW - I have the same pet peeve on a cygolite, especially because if you don't hold the off switch down long enough it toggles between modes, then you have to search for your preferred mode when you turn it back on.
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Last edited by FBinNY; 04-06-17 at 08:34 PM.