I’m personally not interested at all in video performance, but using JRiver just for audio purposes, so JRiver should not underestimate audio users…
I don't think they are underestimating audio users, they are working on DSP improvements in MC29 after all.
But you guys have to realize that audio support in Media Center in general is pretty mature and what I would consider mostly feature complete with a wide list of supported audio features. To me this would mean there isn't really major leaps and bounds Media Center can take besides improving existing features when it comes to audio. My point is, Media Center already supports bit-perfect audio output, has the SoX resampler as an option, has the TPDF dithering as an option, has tons of DSP effects, has support for VST2 and VST3 plugins, WDM driver, HDCD support, supports both ASIO and WASAPI on Windows, CoreAudio on macOS, ALSA on Linux, DSD bitstreaming support for native DSD, DoP and DoPE, etc. Which I'd argue is what most audio enthusiasts care about in a media player for audio only.
Yes, I know people want streaming service (Tidal, Qobuz, Amazon, etc.) support and things like MQA support or other things like implementing the full SoX suite or even things like integrating HQPlayer or just implementing the different filters HQPlayer has, etc. If you do a search of the forums you'll see posts from over the years with JRiver stating they're not interested in those things and have no plans on implementing them. And you have to understand, there are some rather elaborate audio-related feature requests I've seen posted that I don't really think are doable in a relatively short amount of time and ultimately they (JRiver) can't do everything that everyone wants/requests. That's one of the reasons why having a feature requests forum section (with upvoting) is a bad idea, in my opinion.
So, eventually there comes a point where expecting some new, amazing audio features hits a point of diminishing returns, and I hate to say it but we're probably past that point now. That said, there are audio features (or rather improvements to existing features) that I'd like to see like equivalents to the WMD driver on macOS and Linux. Implementing CD playback and ripping on Linux are also nearly at the top of my list. The Atmos audio only files with bitstreaming request seems intriguing to me as well. Also being able to extract individual DSF/DFF files from a SACD ISO like sacd_extract does without doing any conversions. Or if you want to "convert" DSF to DFF or vice versa, just repackaging and changing the container without any conversion.
I mean think about it for a few minutes and post here what you think is a tangible, realistic
NEW audio-related feature that's missing from Media Center (that's not streaming service, MQA, full SoX, HQPlayer, new UI/skinning engine, etc. related)? I can honestly only think of improvements to existing features and macOS/Linux equivalents to the WDM driver.