This is completely incorrect. There is no long story, and there is no grandfathering. Your statement is FUD.
The Bluesound devices were granted Roon Ready designation because even though they do not do everything, they do the stuff that they do correctly, with no cheats or lies, and with the best UX/SQ possible. Signal Path will be transparent as to what is going on.
Since the time at which they were granted Roon Ready designation, they have been provided with the needed information to support MQA from Roon. This does not change their Roon Ready designation. When they add MQA-from-Roon support, they will not suddenly become more “Roon Ready”.