Making good power meters is hard. It doesn’t use a known and tested power meter design that does not appear to be able to be calibrated which also makes you manually change resistance. Excluding smart bikes as I am not sure of the Kickr bike, there is only one smart trainer that does not require calibration to make sure that power is as accurate as possible. That means that there is no way to determine if the data of the IC8 is correct on a consistent basis whether in the short term during a race (manual inaccurate power setting), or the long term (impossible to calibrate and confirm power curve even after a potential firmware update).
Just check out the misery in this thread: Schwinn IC8 Spin Bike