All officially supported factory builds ship in simple UI by default.
However…
Yes, the extended simple UI. I’ve been of the opinion lately that it was a mistake, and should be removed from factory builds… even the ones where the manufacturer requested it.
Every once in a while, there’s an odd case where someone wants simple mode to have only ramp and strobe and nothing else, or who wants it to be long-press-on/off and click-to-change-brightness, but those cases seem to be rare (at least, among people who care enough to make an account and chat online about flashlights).
Instead of extended simple UI, I’ve been tempted to just include a bunch of different interfaces the user can select from. Like, take the top half-dozen most popular interfaces, and let the user pick whichever they like. There seems to be enough room to fit a few, on virtually any light with at least 16K of ROM.