As much as they seem to be moving away from this direction, having the ability to buff certain skills would at least allow for some semblance of optimisation on top of reassemble, like an ammo system that we've seen before. End of the day, MCH has been designed into a corner where it can't excel at anything without having a reason to, whether that be a more complex rotation to increase the optimisation ceiling, or some utility to at least put it on par with its phys-ranged counterparts.