The 7 and the 9.7 have the closest spec, giving an approximation of frame weight difference.I was talking about the 9.8 and that is 22,3kg with tubes and I run tubeless and carbon wheels so its close to 22 kg, but that is only around 1.5kg difference. Still it feels quite a bit heavier to me when I have ridden them (and pushed them up mountains) back to back. Could be the suspension plays a bigger part than I thought, when it comes to the "heavier" feel when riding the Rail 7.
Anyway, I've had no problems with the 2 carbon frames I've had so far. I ran the first one for 2600km, and my 2021 I've ridden 2800km by now. Can't say the same for the Bosch motors though. Replaced twice under warranty on my first one, and yesterday the motor failed on my new one.