Not all LS or even SS clanmobs are behind locked doors, not even the functional ones (scalp turn in, quartermaster).
E.g. Tower has all its mobs, minus the Amyrlin, easily accessible. Eagles happens to have all of them in the manor, behind a locking door. Lion Warden have a number of mobs behind locked doors, but leader mobs are still hittable in throneroom. Ditto for Cairhien and Illian. Silvak is hittable, but the Deathwatch quartermaster isn't.
If I can remember correctly, players wanted the locking door n of Blarg removed because it was used in a "lame" way in pk.