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The biggest challenge to do this technically is to use gyroscope data to work together with the stacking algorithm. It's hard to tune the gyro to work great for any phone. A pure software solution to analyze the perspectives transformation would be too slow.

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Is it hard to tune the gyro because its accuracy is too low, or because it's accurate to begin with but degrades over the course of the long exposure?

Is a pure software solution even reliable enough under these conditions? Slowness can be worked around by doing it in the background, and you get a notification when it's complete. Some people would be okay if that's the only way to get photos they wouldn't otherwise be able to get, short of buying an SLR.

They probably have to have really well calibrated gyros for Daydream, with temperature calibration etc., unless the IMU/gyro is in the daydream holder itself.

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