Tried Roon and I absolutely love the idea behind it. However, the mobile app, at least for Android, is really bad in my opinion. For example: When I try to access my local using folders view, the app just freezes. Killing it and reopening it brings me back to exact same view and the app instantly freezes again. I have to clear app data to get out of this endless loop.
Scrolling also does not feel native in the sense that settling of lists is just different to native Android apps and is lagging a bit (Galaxy S24).
Long story short: Please consider switching to native app implementation. This would, of course, mean a lot of effort, but would probably pay off in the long term. I’m pretty sure that you can solve a lot off issues by doing this. Flutter might be good for simple front ends, but your app is much more than that 
For now, I will not start to use Roon productively (but would want to).