I started a thread about a year or so about this. To summarize, the Roon team is uninterested. They are interested in promoting the false notion that MQA is “hi rez”, as is much of the rest of the industry. The history of the Roon team with Meridian may or may not be a factor here.
Fortunately, it is increasingly apparent MQA is a still born “audiophile” codec of very dubious value. The market is simply not taking it up in any significant way. The Roon team will not be able to privilege MQA in the long run IMO.