Does (can) any manufacturer guarantee this between all the products in a batch?
Sound quality is very subjective parameter in any case, I am on the Naim beta testers and early on in a release they are several posts saying that they think the sound quality has improved with the latest iteration only for Naim HQ to row in and say they are not happy with the sound quality and sudsy quite a few of the testers hear it differently and notice the reduction in quality.
And as set ups generally are a set of compromises between your system, your ears and the room what 98% of Roon users might call a sound quality improvement could well be disimprovement in your set up.
I would imagine the cancelling of subscriptions and refunding of monies would be logistically costly in the same way as a monthly subscription seems to be difficult for Roon to implement in a cost-effective manner. But maybe not, I don’t know how Roon handle such requests at the moment. I think it way we’ll be similar to-
.sjb