Makes it easier for the engineers to not bother with proper math. She doesn’t have an email address, so signing her up with my email address may create a whole new snafoo at zwift accounting! Or maybe they’re expecting I’d make a burner email address, sign her up with that… makes the whole thing so messy. Anyway, I guess this is the price we pay for having people in the world who want to cheat at everything.
No, they do take the weight at the time you set the PB and average it. They do not assume the lower weight for 3 months. You would have needed to set the PB at the lower weight.
I think you have it right here. Riders will drop their weight by 50% and their very next ride is a race up the Alpe. The only way to prevent that is to stop the change before it happens.