The positonals would be a big deal, but the general speed of jump animations might be what affects your experience the most since that's what originally got Dragoon its "floor tank" notoriety. Here's a video of the old jump animations for reference. The quality's rough, but you'll get the idea.
Yes, Luminiferous Aether also had an enmity reduction effect like Shroud of Saints did. I believe both reduced your enmity by 50%, not reduced it to 0, but regardless they served their purposes.
During ARR, there was no Lucid Dreaming. White Mage had Shroud of Saints. Like Lucid Dreaming, SoS gave you an MP regen, only on a 3 minute cooldown instead of being available every 1 minute. It had a potency of 80 and lasted 15 seconds, whereas LD has a potency of 55 and lasts 21 seconds. MP wasn't always a flat 10000 back then, so I'm not sure how different MP regen was, but LD now restores 38.5% of your max MP every minute. If we translate SoS's values to today, it would restore roughly 46.6% of your MP every 3 minutes. White Mage also didn't have Assize back then, so no extra 5% MP every 40 seconds either.
Scholar, on the other hand, had Aetherflow which restored 20% of your MP every minute. Now, I never really paid attention to exactly how much MP Energy Drain used to restore, and no quick google searches say anything about how much it restores your MP by, but looking at an old video, it looks like each use of Energy Drain restores roughly 5-6% of your MP? And you could do up to 3 of those per minute as well, meaning that's an extra 15-18% MP you could regain every minute. Even if you never Energy Drain, you're still looking at 60% MP every 3 minutes to White Mage's 46.6%. Also, White Mage had no way of healing anyone without spending MP outside of Benediction, which is single target and had a 5 minute cooldown during ARR. Scholar has Embrace healing, which was 300 potency during ARR, Whispering Dawn, and Lustrate.
Scholar was literally the only job I played at all during ARR, and MP was not often a concern for me, though I did absolutely carry Ethers anyway, because Extreme fights and Coils definitely pushed me to overspend on MP a lot.