Does the RAAT version matter?

Yeah but

is a direct contradiction to the RAAT design link,

“This means that we are capable of completely re-designing the audio streaming and buffering logic without updating device firmware. This is absolutely critical, since most of the bugs + evolution in a system like this relate to networking”

I think we must be very careful here regarding what kinds of updates and bugs are considered. Of course, there won’t be any firmware updates and this will prevent any changes that require firmware updates, including e.g. new Roon SDK versions. However, as per the design documentation, this should not prevent Roon from dynamically delivering the majority of updates they need for RAAT. Or, as the documentation states, “In fact, the only reason [a firmware] upgrade should be required is to fix a low-level bug, or to access more hardware functionality .”