I understand the concentric spheres concept. But who defines the spheres?
Take for instance your example of “Daily Mass Readings”. Traditional Roman Catholics, e.g. FFOTI, FFSP, ICK follow the traditional Catholic calendar; their daily Mass Readings are not the same as those posted on this forum; but I don’t see anybody complaining.
The spheres are defined by the ones posting caucus threads and by the moderators enforcing them.