Perfectly put. As in the visual arts where beauty is in the eye of the beholder, in the aural arts sound quality is in the ear of the listener. To make any claim would lead to endless unwinnable arguments over claims and counterclaims that cannot be objectively proven. Sound familiar?
Also, at this point, these firmware upgrades are mostly undertaken to improve the functionality of existing features and to provide a more robust platform for the later addition of new features. Not to say that changes in the SQ are not possible but they may only be apparent to some.
I am sorry to have started this. I only wanted to inform the OP that JR was unlikely to respond to his demand for assurance that there would be an improvement in SQ. As is said, "no good deed goes unpunished". And before there is any name calling, let me also say that at my age, I am certain that I have been called worse by better people.
I am done with this argument and any further response is up to JR at Sonore.