I have a 2022 Scott Spark RC Pro and have no problems with the XTR brakes and have only bled them twice during routine maintenance since owning the bike.
Thank you very much. For those who are interested, I'll shortly explain why I have a very negative attitude towards the XTR brakes on my Spark RC Pro 2022 (which I am very happy with otherwise):
First, the rear brake is driving me mad. If I sum it up, I have spent at least two whole days in the meantime with attempts to mobilize the pistons. I am convinced that I'm doing this correctly, because the brake works as it should for about 100 km each time. Then I need to do it again. This means that I have do it every week, and each time it costs one or two hours of my precious spare time, and even longer if it doesn't work immediately.
Second, the XTR BL-M 9100 does not feature ServoWave, does not feature the toolless reach adjust (admitted, I can go without that as long as I can adjust the reach using a tool), and does not feature the free stroke adjust.
Third, the XTR BR-M9100 is not compatible (that is, may not be used) with 203 mm rotors. This is completely ridiculous (although I don't need 203 mm at the rear brake, I need it at the front brake).
For these reasons, I have now decided to remove the XTR brakes completely and replace them by XT brakes (8100). Unfortunately, this requires replacing the rear brake hose by a SM-BH90-SBM (which made me write my previous post).