I created this thread in 2016. Four years later (in 2020) there are still umpteen threads on the Roon forum complaining about lack of functionality with classical music, like
this one. There are the usual people suggesting complicated workarounds, or telling people to manually edit collections of 50,000 tracks. That thread is quite fun reading, there is the usual smug attitude of the community moderators dismissing everyone's concerns and insisting their way is the best. Then there is the desperation of people who have blown an enormous amount of money for their overpriced software that doesn't work. They too are airily dismissed by said smug community moderators.
So we have a piece of software that costs $800. It is billed as a way to find your music, but it can't even do that. At least not without manually editing 50,000 tracks. Why bother, when JRiver costs $60 and you can actually find your music? I have a touchscreen that shows me all the composers as icons. Tap on one, and it gives you a choice of all the compositions by the composer. I can also customize settings to hide tags that I don't want (e.g. no point showing "classical" genre when 99% of my collection is classical).
Seven years on now, and I doubt if they have done anything. Price has gone up, and concerns that have been expressed repeatedly over the years have been ignored and the complainants belittled.