It's a lot less relevant than it was, but it's still relevant. You can still end up needing to use Lucid on casters and healers. Especially if they need to resurrect or die or do their best firepower.

One of the issues with 1.0 was that no matter how much you casted, you never ran out of MP. That criticism was made by Yoshi-P himself. So if we get to a point where there is no situation in which you need Lucid or any other MP regen ability, then it's come full circle.