Nick Petit

If the prim count is an issue, you can deform the fractured mesh instead like you do with your bending metal but while your stage will be happier with fewer prims, your disk space will take the hit instead. That was the motivating factor behind the RBD Procedural.

The RBD Procedural is a Husk procedural - it gets evaluated when husk runs and bakes the result of the procedural into the usd that husk feeds the renderer.
Under the hood, the RBD Procedural is the equivalent to a deforming fractured mesh with the various parts of the mesh being transformed by points - either as a points primitive stored on the stage or a bgeo point cache. The main advantage of this is you don't have to worry about writing out all the deformed mesh animation to disk, which can take up significant amounts of disk space, as this is done just in time before rendering.
If you are going to Katana, husk won't run and husk procedurals won't be executed.
You can export your RBD sims to USD as deforming meshes or as animated Xforms depending on your needs and what performs the best for you.

For some reason the lpetags "A", "B" and "C" aren't playing nice. It looks like single capitalized letters are being ignored, if you change them to "a", "b" and "c", or "AA", "BB" and "CC", it all works as expected.