That's exactly what I'm worrying about. By far nobody was able to come up with scientifically supported explanation of "cold" IMU calibration procedure. Somebody, long time ago, discovered this way of calibration, and most of us blindly follows the recipe. We all know that the procedure eliminates annoying (for some) "warming up" statement on Go app screen, but what it really does to somehow crucial calibrating process? Aren't we messing with IMU calibration for this stupid 2 minutes of waiting before first flight? Perhaps sensors really need warming in order to work properly?