Is lucid dreaming good?

[Seraphor]

Actually no. Lucid Dreaming restores gradually up to 3500 MP, Manafont restores 3000 MP instantly. Ergo, they serve different roles. Removing one in favor of the other also means that the devs have to go back and rework Black Mage so as to accommodate the fact that a job skill is now a role skill by giving the Black Mage a new job skill that also relates to Black Mage's MP. OR the alternative being Black Mage just doesn't get a level 30 Job skill if the devs don't want to actually fix the void that is created in this manner.

The better alternative would be to simply buff the potency of Lucid Dreaming so it gradually restores more MP.

Black Mage doesn't use Lucid Dreaming at all, it's a dead skill. That's why they have Manafont.
If they axed Lucid Dreaming and made Manafont a role skill, then BLM wouldn't change at all, except they'd regard it as making room for a new skill, which it's bound to get in the next expansion.

While they do function differently (the whole reason why BLM can't use it) the end result is pretty much the same, for other jobs, the difference is just when you use it.
You want to use Lucid Dreaming when you get to about 50% MP, give or take, basically so that you don't waste the MP by being too high, and you don't risk running out before you've recovered enough by being too low. Manafont as an instant on-demand MP boost instead of a regen would simply change your decision into "use it at low MP" instead of "use it at medium MP".

[Veis_Alveare]

You want to use Lucid Dreaming when you get to about 50% MP, give or take, basically so that you don't waste the MP by being too high, and you don't risk running out before you've recovered enough by being too low. Manafont as an instant on-demand MP boost instead of a regen would simply change your decision into "use it at low MP" instead of "use it at medium MP".

As a healer you should be using lucid around 70-80% then on CD after. You'll lose some of the restored mp but it's literally just better to keep it rolling - especially if (on WHM specifically) this lines up with your dot refresh for the sake of weaving.

Not sure if others mentioned, but Lucid Dreaming also helps shake off enmity. I don't know if there's any other other skill that lessens enmity for healer/mage classes (though maybe that doesn't matter withtanks being able to get and hold aggro easier now).

It hasn't since ShB started.