Why not just use the 600 other things they have that can do that.
I mean metaphysic particles are kind of pathetic next to technology that can raise the freaking dead.
We don't know how reliable and consistent those "other ways" are, there does seem to be a reluctance to employ them. Nor how acceptable they are to the majority people of the federation membership.
Sure federation medical science can give Picard an artificial heart, LaForge a visual scanner, and Neelix one transplanted lung. But in terms of a more natural treatment and a holistic medical approach, the particles would be more in line with that.
Not that tech.
I'm talking about the good shit.
transporters that can de-age and re-age people with a couple of button presses, the genesis effect which can raise the dead, replicators that can make replicate tissue, and ect.
All these one off wonders the federation always seems to forget about at the end of the episode.