People tend to flock more to PvP when there is a reward that they really, really want like a mount or a glamour set. The Revival Wings discord often has a hard time getting Rival Wings going even one night per week on my data center, yet during the last irregular tomestone moogle event Rival Wings was one of the queues that offered that currency so you could get in almost every night at prime time. Frontlines is part of the daily roulette for the Duty Finder so it also is a go at prime time. Many people have little idea of what they are doing but they want the rewards so they join in. That isn't a criticism, it's the just the economics of the incentive. Lots of people get into PvP in FFXIV and grativate toward specific PvP modes with the right rewards.
That said, PvP can be more fun when your allies have a basic grasp of the mechanics and dynamics of Frontlines, though. Some things could fit with an instanced tutorial, like learning that:
Yet there are other ways to learn these things so if anything a tutorial would likely just be conversation with an NPC. Or having tutorial messages (that could be turned off) for new FL players that would pop up, like "You were knocked out. Be careful of getting KOed too often as it costs your grand company points!" But I don't see SE adding either.
- after you queue in on one job, you can swap at your base to another job and still get leveling experience for PvE
- you can use return to go back to the starting spot at your base if you get cut off or surrounded or want to go to an objective near there
- getting knocked out in any Frontlines map drains points from your grand company that go to the grand company of the player that KOs you
- in The Bordland Ruins (Secure) map, points tend to mostly come from capturing and holding the different ruins (which enemy grand companies will try to take from you) but also from drones that periodically appear in the middle of the map
- in Seal Rock (Seize) map, points are awarded from capturing tomeliths as they activate around the map, and enemies can capture them from your grand company to drain remaining data
- in The Fields of Glory (Shatter) map, points come from capturing the big tomelith by an enemy's base and by doing damage to frozen tomeliths around the map as they begin to thaw
- in Onsal Hakkair (Danshig Nadaam), points come from capturing ovoos as they appear on the map and once captured another grand company cannot recapture it for themselves; blue triangle ovoos (B rank) are worth the least, red diamond ovoos (A rank) are worth more, and yellow pentagons (S rank) are worth the most
Other lessons would be hard or impossible to add to a tutorial, like strategies and tactics that come about through observation of typical player behavior on different maps under various circumstances. That's why factions with experienced and perceptive signal callers often have an edge over groups that run around chasing other players and scattering to the wind.