@Roccandil the reason why FF must exist is because if it does not then it either:
- gives a huge advantage to good alignment vs evil alignment
- severely restricts evil alignment playstyle
Players can either be in PvP mode or out of PvP mode. Now, if you don't activate PvP mode, you can't attack anyone, so we can disregard that mode for time being.
Being in PvP mode, you can attack people (you also need to be in this mode to defend yourself, because you need PvP enabled to damage your attacker).
So now there is bunch of people fighting, and all people are in PvP mode, there is a mix of good and evil aligned players from different guilds here (we will exclude neutrals for now for this to remain simple).
Evil aligned people, will want to not only attack good aligned people, but other evil aligned people as well, so if you do not offer them friendly fire you are completely restricting their way of playing, up to the point where it isn't worth playing the game for them.
Not only evil aligned players are in question here, but good part of good aligned guilds, will perhaps want to have a fight (surprise attack) with another good aligned guild that treated them poorly before, in this mayham, so they would like friendly fire enabled as well (this excludes Arboreus of course, I'm talking about Syndesia and Tartaros here).
So If you disable friendly fire existence, you deminish play quality for great majority of evil aligned players, and a good number of good aligned people as well.
You also can't really enable friendly fire for evil aligned people, and turn it off for good aligned people, because (alongside depriving the part of good aligned guilds of play options with this) you would give huge advantage for good aligned people fighting in this mayhem, vs all evil aligned people because they couldn't damage each other, while evils could.
The only way to deal with this is to enable friendly fire for all alignemnts on Syndesia and Tartaros (keep it turned off for Arboreus), and then let people deal with those few "friendlies" (which aren't really friendlies then) that would deliberately stand in their line of fire, by (watching where they are shooting first) and if that's not enough, then using social mechanics. Guild kicks, alliance breaks, refusing to trade with them, and everything else that goes along with it.
This is sandbox, let people deal with people, instead of having mechanics completely diminishing play style options for almost everyone, just to keep few people happy (people that would dislike getting few minus karma points by occasionally hitting same alignment player).
There will surely be quests to get those few points back up when you rarely lose them, plus you can be careful where you are shooting, plus you only get karma points down when you actually kill a person.... your single spell hit will hardly one shot anyone (unless he is already on 1% hp, which will likely get him killed by something else even before he manages to get hit by you).
The situation that you are describing where you would manage to kill someone with aoe, and loose a point or two will happen super rarely, and when it does few points lost doesn't mean anything, and you can get them back later. And you can avoid that if you are somewhat careful in the first place.
For that, it's not worth to exclude friendly fire from game, and completely diminish its features and overall combat quality, just to make occasional player with OCD that doesn't want to lose a single point of karma EVER, happy.
TLDR: (but do read if you care about extra reasoning)
Without friendly fire, intra-alignment skirmishes and fast surprise attacks, just aren't possible, which would bring this (potentially great) sandbox game down up to the point of not being playable for most people that love PvP. And activating friendly fire only for evil alignment (but not for good) would bring a huge disbalance in mass combat.
This is why friendly fire needs to be enabled for everyone on Syndesia and Tartaros, and disabled on Arboreus (to cater to PvE players as well).
By not having friendly fire we can just play a game without PvP then, with just voluntary pre-triggered GvG... because that's how it will really feel like. Like another PvE MMO. (But I guess that's what you would like, it's why you are asking for this.)