Well, if someone who has taken part in countless boss fights over the last 10 years watches a boss fight on youtube, I think that person can pretty well judge the difficulty of an encounter.
Only to a certain extent. Keep in mind that the underlining aspects of the game were pretty different, not to mention the whole mess was put on a highly flawed framework. 'Latency issues' Wasn't just lag, but essentially a delay on everything, including actions taken on both player and computer's end.
I'm interested in seeing how Hard Mode Ifrit changes, honestly. Yeah, we've seen the level 30 version, but I wonder if hard mode includes moves we do not entirely expect, or uses them at a pace much faster than before.
Somehow I have this sinking feeling that Ifrit will be harder and Garuda easier to the point that they're more or less on the same level of difficulty.