Law has become super specialized like medicine. The lawyers the Sussexes have may be able to help with the forms, but a patent lawyer can tell someone what's acceptable or not right off the top of his/her head. A patent lawyer would have told Meghan why ARO couldn't be used and the reason without even researching it and probably tell her all the other stuff that she did incorrectly that USPTO denied.
Some lawyers that aren't in the specialty will take a stab at it with the warning it's not his/her area of law while others flat out won't touch it.
My feeling is Meghan and Harry have filled the forms out and done the work all on their own, well, Meghan has done it for Archewell, Archtypes and now ARO. The reason is she thinks she's smart enough to apply without asking for assistance, she was on Suits so she "knows" the law, they are the Duke and Duchess of Sussex so the Fed. Govt. is supposed to be so impressed that it will automatically say "yes" to whatever she wants and look the other way if there's something dodgy that she's done.
This is Meghan's (and Harry's) third rodeo with USPTO and by the agency's denial with this latest, it's clear, the agency is irritated with Meghan. She still doesn't listen to advice or seek assistance.