Thoughts on interject.

[RopeDrink]

There's no need in that fight to Interject any of them save certain AoEs and Stoneskin, though.

There's no need to do a LOT of things during certain scenarios.

Interject may not be a commonly used button, but it absolutely does serve a purpose in various content, even if you can simply not press it and get away with it perfectly fine. That type of thinking can be stretched over so much of the game, given everything lower than high-end content is devised so that practically everyone can complete it even if they spent their time eating their own arm rather than actively trying to win.

You don't NEED to interrupt the Stoneskin in Haukke Manor, but it bloody helps. You can just ignore it and whittle down her obnoxious shield the normal way if you prefer, but it's not optimal. You don't NEED to interrupt Seductive Scream, but there's nothing more annoying than being hard-controlled for 5-6 seconds and manually walked into an AoE because a ranged DPS or tank doesn't know they could just press a single button and save everyone the hassle, especially when you have stun-happy players and can't use that as an alternative, such as spamming Holy during the final double-pull. You don't NEED to interrupt True Bravery, but given it provides a sizeable damage buff to the boss, letting that through is just laziness if you're aware you can stop it with a simple oGCD.

The issue is less about how useful it is and more about how its usage is so limited. For all we know, they may very well play more on the idea in further dungeons and raids, but even if that happens, it means we still only have niche scenarios where it's truly useful outside of it. It may very well get removed, or reworked, but until then, there's no reason to just take it off your bar.