Great to see enthusiasm around improving and expanding Roon’s scrobbling support, but just in case anyone is not aware, Roon already supports scrobbling to Last.FM – you can find the details here.
I know there have been some complaints about duplicate plays getting logged (in Roon history, and subsequently in Last.FM scrobbles) and I can confirm this is something we are actively thinking about.
I don’t have any news to share about official Listenbrainz support, but if it’s important to you, please vote for the aforementioned feature suggestion here.