You're just establishing that for a given persona there is a spectrum from 'Mask' to 'Identity' and insisting that there is an arbitrary threshold.
For a moment, embrace a worldview that there is no singular, core Identity -- in fact all personas are masks to some degree. An Identity may be a mask you're particularly dedicated to wearing, but it's still a mask. The rest of these "systems" people's perspective follows from this point and emphasizes certain experiences -- that you may suppress -- over others that you may hold on a pedestal.