I'm sure the mask will be great for the type of person who, when the play the Elder Scrolls, makes one character who joins the Thieves Guild, the Mage's Guild, the Fighters Guild, The Dark Brotherhood, and any other faction they can find. (Complaining online about how dumb it is that they can join every guild is optional.)
Speaking just for myself, I am not that kind of person. If I want to join 4 factions which all have mutually exclusive philosophies and favoured skills, I make four different characters, one at a time.
So for me, if I have a D:OS 2 party of 4 characters picked out, I'll just try to play the game with those 4 characters, and I don't mind if not using the mask means 'missing content' on that playthrough.
