Those BLMs who literally stand in one place aren't using the job effectively. We have tools called: Thundercloud, Firestarter (forced from Sharpcast if not RNG, and both of which now have extended durations), Swiftcast, Triplecast. Even without RNG procs, that's 5 instant cast spells. All of which require you to wait for the GCD before starting another. That's more than enough time to allow you to move around the battlefield, and even if the distance is too great you can then make use of Aetherial Manipulation, without the animation delay disrupting your casts since you're on the GCD anyway.

And yes, we do still have good enough utility via the role-share. Effective use of Addle, Manashift and even Apoc sometimes can literally save people from death.