That is certainly correct. But I think the real reason people don't particularly care about PvP is that it has very low applicability to the rest of the game.The reason I say PvP requires more skill is because when competing against actual people who know wtf they are doing, you are no longer on a single set strategy like you are against most HNMs. PvP requires quick adaptation to constantly changing situations which you might not always be ready for. If you can adapt to your situation, you can overcome it. You can't read up Wiki on how another person might react to your actions. If it were me, I would make sure your HP hits 0.
Ballista discourages gear swapping while the entire rest of the game is built on it, for example. It's rough enough for most people to have to leave everything at home so their macros don't accidentally switch into other gear. But to also have to have a gear set that can even run contrary to how they gear for the rest of the game.
And generally you aren't gunning for moving targets, unless you're doing a kited fights. Even if it is kited, you can generally predict what direction the target is going in. A BLM could time his nukes accordingly. In Ballista, a person will see a BLM casting spells and they will generally do one of two things: switch targets and do something to stop the BLM, or run in the opposite direction. This is not typical mob AI behavior.
You can learn a lot about the mechanics of your job through Ballista, the various benefits and disadvantages of certain playstyles, the downsides to abilities or spells you generally never have to think about, or have an element of surprise against players who don't know the full capabilities of certain jobs simply because they never really see it in practice in the rest of the game (Ballista is the only reason I have Feral Howl merits capped for BST. It's like an instant ability Stun that ignores shadows and is not a spell so it can be used on the run).
But a lot of that knowledge really goes wasted in the rest of the game because- let's face it- the AI in this game is generally very stupid. It's the AI that casts Silena on itself when Silence wears off (I haven't tried it yet, but I bet they cast Stona on themselves if you cast Break on them too). It's the AI that casts Sleep on players that have DoT on. It's the AI that casts single target nukes on players that can clearly put up Utsusemi. It is by the grace of simply being overpowered that the toughest enemies in this game are tough. They aren't actually capable of outsmarting players.
In the rest of the game, you can use Retaliation in good faith that the mob is not going to suddenly disengage and starting firing off spells or ammo at you. You can use shadows knowing that it is not going to intentionally use Area spells to clear them. You can be a pet job knowing that the mob doesn't actually know the master is the easier of the 2 units to kill. You can rely on enmity to keep your mob away from your healers. You can count on it that mobs don't predict how much TP you have so they can sidestep you or put up their defenses at just the right moment.
Unfortunately, it's really everything that makes Ballista a unique and enriching experience that also makes it unapproachable to the majority of the player base. We, on Siren, were lucky enough to have a few uncapped matches recently because one player took the initiative to shout and start sending /tells around to people who were dedicated Ballista players prior to the level cap increase. And for that, I am grateful to him. I was just beginning to wonder why I still even play Final Fantasy XI, since I always used to say I would lose all reason to play if Ballista died. Up until now, Ballista hasn't taken place in almost a year and a half.
Somebody's not wearing enough PDT.ukko's fury one shots people even with giant's drink on lol