Long time lurker that is bursting with questions!

[Worldtree]

You can probably look up handheld sandblasters and airless sandblasters to see what specifications and capabilities these tools have now.

Also this article falls into a common problem, as I see it , of exploring all sorts of ways to weaponize the exotic technology even when a more likely common use might be manufacturing or construction or some other everyday purpose (which isn’t explored here)