After doing some broken shore grinding, it should be obvious that mobs need to be taggable by all players of both factions.

Farming things like Sentinax mobs is just painful, more than half of the mobs there are useless to you since the other faction is also there farming with many players. I like the broken shore, but the fact that you can't get credit for all mobs in a mass grinding party just destroys the mmo feeling the zone gives. Blizz needs to get on this ASAP imo.