Everything I do is manual, I don't really have duplicates unless I get singles then get the album once it releases. Even then, unless the single comes with extra bonus tracks (seems to be a lost past time, never see this anymore) I will delete the singles after.
Here is the forum post I originally found years ago to setup music picard to tag multiple genres, which is the only setup that I have that took extra effort and not just use out of the box defaults.