Agreed, as an object for geeks sensor quantity is critical. Barometers in waterproof devices are tricky, and a heart rate sensor is still an exotic manufacturing challenge, not an off the shelf product. And I don't personally need a touchscreen, I think app development for the form factor is far easier without the temptation of impossible touch targets and cryptic gestures. But the critical sensor to me is GPS, without that it and the PineTime are useless to me.

The only sensor on this is the Bosch BMA423 3-axis accelerometer. Unfortunately, that has no gyro or magnetometer, which makes it a bit of an odd choice. It's supply constrained, and has an EOL date of Sept 2021 to boot. The other sensor is a DS3231MZ low-power highly-integrated real-time clock. It's also out of stock, and has a 42 week manufacturer lead time.

I've got some experience developing embedded hardware, but the watch form factor is really hard to hack after the fact. It's not particularly friendly to expansion busses and add-on cards...