We aren’t defending Roon. Some of your comments come from a lack of knowledge. Roon is different and requires some effort to fully exploit it. The “focus” and “bookmark” functions in Roon allows for several of the issues you’ve commented on. Apparently you are unaware of it. Did you use this forum to find out how to solve issues you had during the trial? Doesn’t sound like you did.
Folders - you are stuck on that method of navigation and don’t get that Roon works another way. You are free not to like it, but Roon ihas chosen not to use folder view and has a much more sophisticated method of navigation and one more suited to modern technology. We can also get to our albums in Roon in 5 seconds. Folder view isn’t necessary for that.
Tagging- there is no perfect tagging solution. Tagging isn’t standard, and record labels tag haphazardly, so there isn’t any software that doesn’t have issues. Roon does allow you to re-tag and display your files using those tags.
MPD doesn’t stutter on the same files - means something is amiss in your Roon setup. Roon has no issue with even much bigger file formats/sizes.
We get that Roon isn’t for you. But that was a foregone conclusion since you seem to have approached it with a closed mind and didn’t use your trial period to find out how to use it the way it should be used.
I’ve partially gotten around this by creating “genres” that I don’t want played and then not including them in my focus groups and bookmarks. If, for example, I don’t include the “christmas” genre in my focus groups, I can call up my groups and those songs don’t appear.