The moisture sensor in practice
I tested this specifically because I was skeptical. On a pre-dawn hike in light rain on the AT in Virginia, the lamp switched to flood mode automatically about 15 minutes in when the rain started. The path was clearly lit and there was no reflection glare. I hiked the rest of the approach without adjusting anything. That's a small quality-of-life improvement that adds up over a lot of early mornings.
For hiking without any precipitation, the spot/flood toggle is a standard two-mode system controlled by a single button. The button interface is simple enough to use with one hand, which is important when you're adjusting settings with a pack on.
Battery life at real brightness
BioLite rates 40 hours on low. At mid-brightness (which is what most hiking actually uses — probably 200–300 lumens), I get 8–10 hours between charges. For a weekend trip where I'm using it for morning approaches and camp evening use, that's enough to go without charging. USB-C charges fully in about 2 hours.