I have to give you this, the use of the dash is inconsistent and probably annyoing to people with some degree of OCD like me (and you?). The great thing about MB as a database is that no matter what the artist calls himself, he will always be identified correctly by his MBID.
If you come here to tag your own collection, like many of us do, just edit the artist tag in your files to your liking if the player software you use can use the MBID to identify him (i.e. Kodi). That way you get consistent names in your files but you’ll still be able to have the correct info retrieved by the player - the best of both worlds.