A prepatch would be pretty cool, but, it's either a lot of effort to make an event that'll only be experienced once (though I guess they did do one of the most amazing prepatch events at the end of 1.0)- or it's lazy and annoying.

Like, WoW has them of course... but usually it's just mobs wandering about. The ShL one was one of the worst things I've ever seen and the game was made worse for it existing- the BfA and Legion ones were fun but they also had a lot more to them and were far more narrative.

Thing is- WoW uses their prepatch to set up the story of the next xpac which may have zero to do with the previous xpac.

FFXIV uses their entire xpac to set up the next xpac, and their final patch basically has more to do with the next xpac than the rest of the xpac it is in- this basically is the prepatch we're in right now, and it's considerably more in depth and extensive.