1 sample per crank revolution doesn’t pick up the huge variation in power applied during the pedal stroke
This graph shows a sample rate of 32 per crank revolution. Sampling 12, 32 or 64 times per stroke increases accuracy but complex algorithms are needed to “calculate” the power output.
Only InfoCrank power meters sample the torque 256 times per pedal stroke.
This results in every pedal stroke giving an accurate reading without the need for complex algorithms. With independent measurements taken on both left and right crank, a detailed understanding of the pedal stroke is available to the rider.