At least it looks like they improved the firmware update routine in the newer version. I was just prompted to update to .129 and the process went through at the first attempt. It took several times with the previous one to update to .121 from .102.
As for Mate 20 Pro B171 or higher to get new features...I still fear Huawei might leave not chinese models in the dust, the Freebuds 2 app is still officially China-only after all, the globally available Freebuds Companion app has just been updated but there are no signs of the Freebuds 2 being supported there. We'll see, I'd just want HWA, I can leave without the Bone stuff.