The problem is that most of people on BLF not need a headlamp. For example on Russian flashlight forum fonarevka.ru obout 20% of discussions are about headlams(here I see 2-3% at the best), and I know about 7 custom made headlamps at small-scale production and only 3 such flashlights. There are a lot of people who use headlamps in work,outdoor , fishing, sking, caving and so on. On BLF I see only lumens fans(some of them are Hicri fans too and I like it). 100500lm and 2km FET controlled hot rod with stepdown after 10s on ones head are absolutely useless in real world.
Nevertheless I would be interested to see as BLF headlamp for example something based upon H03 with hi efficient buck or boost driver with one of BLF UI , hicri led and maybe good build in charger, or maybe something in more exotic form factor like Panda 3 . Magnetic control ring also is very interesting element which can be very convinient, but almost non existing headlamp use it.