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My concern is that for me, 'discussing hit and hurtboxes' happens whether I have a scanner or not. I know they exist, I learn them by just playing the game naturally, I am, in all arrogance, basically a savant at 'seeing them without the scanner' which makes my skill valuable in analysis (cat is credit to team!)
But unlike a Realtime Combat Tracker where the 'way you tell if someone is using it' is 'how detailed information they have is relative to your perception of human capacity' (for observation and arithmetic, basically), it's much harder to judge for a HTBox.
Even more troublesome, I think, is that they're a 'moment to moment' thing. If you ask someone 'please use this ability instead, I think it will do more damage', I think you can get away with that even in FF14. If you 'try to explain the enemy HTBox/Frame Data to someone in chat so that they can improve performance', you normally don't have any way to be less specific.