I should be more specific. I was thinking road pedals not MTB . I don’t believe there are any SPD-SL compatible pedal-based power meters and originally Shimano blocked IQ2 from producing a shortened SPD_SL axle to compensate for Q-factor. I am not sure why Shimano is reluctant to allow SPD-SL pedals to be licensed. It’s even difficult to find non-Shimano SPD-SL cleats
IQ2 announced there will be a mountain bike version based on the what I assume they meant the ubiquitous 2-bolt SPD cleat, which has been out there for years and used by Wellgo and countless others.
Why one and not the other? Shrug.