I agree, it's very useful to have a dedicated thread of an artist for regrouping songs.
But what I meant is that regrouping into a playlist is not useful.
Some users might edit and correct themselves, but most won't.
I know many people that download songs from the forum when they get a request in a gig for a song they don't have in their library. They usually don't have the time to check for errors and edit the chart.