Anduril is way overengineered. I like this UI that some of my lights have:

While off:

• One push: Turn on at the last used brightness.
• Two pushes: Turn on at maximum brightness.
• Three pushes: That strobe mode that you don’t need but seems to be obligatory.
• Hold: Turn on at the lowest brightness (or moonlight mode if the light has one).

While on:

• One push to turn off.
• Two pushes to toggle between maximum brightness and the last used “regular” brightness.
• Three: That strobe mode that someone has to have some use for.
• Hold: Alternately increase or decrease the brightness.

That’s pretty easy to learn and gives you all the functions you’d reasonably need (plus that strobe) without a lot of clutter.