The Problems With Ninja In Endwalker

[Seraphor]

Not exactly a melee equivalent of Triplecast. A melee-equivalent of triplecast equivalent would be just any instant-cast weaponskill in melee range. Gap closers specifically direct you towards one direction and becomes much less flexible if it forces a gapcloser in your rotation. Think about RDM. The difference is that RDM actually benefits from this since they have a melee combo and a disengage to go back into range. They have the potential to delay their melee combo because they can hold off on spending their black and white mana for a long time, especially with the new Endwalker changes, so it's not a real problem if they have to enter melee range. Ninja is pretty much the opposite. They have ranged attacks that enable them to stay within a range briefly before going back in (with Shukuchi). However, having a gap closer as part of their ranged rotation locks their ranged mobility by keeping them within melee range at all times. This creates an issue for small disengages if the AoE is big and you need a lot more time to run out of the AoE beyond just a single Raiton, but not beyond 2 Raitons.

Imagine now if RDM was doing their melee rotation, but on your 2nd melee combo skill, displacement's effect changes and and you lose a big damage increase if you don't use it. However, displacement prevents you from using your final melee combo skill immediately by forcing you to run back to the boss to hit it will delay one to two GCDs - in other words, a downgrade to the flexibility in the skill. What does that mean? You have to save corps-a-corps specifically to counter Displacement. That also means corps-a-corps is no longer as flexible as a gapcloser tool because it's being a 'forced' gapcloser. That's basically what people believe fleeting raiju will become in terms of flexibility.

"Not exactly a melee equivalent of Triplecast. A melee-equivalent of triplecast equivalent would be just any instant-cast weaponskill in melee range."
You just described every single weaponskill ever.

Melee don't have to worry about movement, they have to worry about distance. Distance is the melee equivalent to a casters movement, therefore this is the equivalent of Triplecast.