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Other fitness trackers seem to use a pulsed light
I guess it is because of power saving, led draws a lot so you light it up only when it really matters.
As for the accelerometer movement compensation (again just my guess) maybe they use it just to know which data they should discard and which is safe to use, which is kind of compenstation.
fanoush
Other fitness trackers seem to use a pulsed light (I think to get a reference light level, so ambient light change might have a smaller effect?), the Bangle seems to use an always on LED. And saw some chips use accelerometer data too to try to compensate for movement.
Haven't checked the hearth rate monitor's code (no free time, so let's just browse the forum...). Anybody with some free time to read papers and do some magic? :)