I honestly don't have the PvP experience to suggest/comment on the finer details, but assuming I at least somewhat have my finger on the pulse when it comes to the wider ecosystem of Haven:
==PvP QoL will benefit people unable or unwilling to engage with PvP==
If you make PvP tedious, whether intentionally or not, most people will drop out, but a handful of griefers will persist. They will turn Haven into a gankbox in their aim for the "skeleton pile high score." If hunting those griefers was even remotely viable, certain people probably would do it just so they could post a Moot thread about it.
==Factions aren't (at least automatically) bad==
Of course a dominant faction could easily have a toxic impact on the Haven ecosystem, but tying to my previous point, alternative is a complete anarchy. There's already a skeleton of a system to create at least somewhat symbiotic system for factionbois and casuals. Something as simple as embracing that Realms are EXP banks for the owners and tying "taxation efficiency" to the amount of buffs provided, could provide enough meat around those bones.