90% over 30 seconds would take 54 seconds for a enmity-halving skill to come even against. Noting also that Diversion will be ready for recast in minutes rather than Tactician/Refresh's 3 minutes, those 54 seconds make the skill cut awfully even in total effective throughput in any fight under 7 minutes. When you consider also how valuable that opening half-minute is to overall DPS, and therefore how much effective (tank) DPS can be gained through reduced enmity needs, I'd personally have to consider Diversion the one of greater use even if a tank easily could hold back a Bard's full burst without it -- which, they frequently cannot.
This is less required for a MCH, since at least Wildfire gives more time for the tank to catch up compared to an instantaneous bonus and the turret divert's nearly auto-attack's portion of damage off the MCH itself, but Bard's wholly personal and undelayed enmity, with even more immediate burst if Barraging EA or generating a rapid RA than MCH is enough to make a NIN worthwhile if even just for its enmity tools in the initial burst.



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