In the US, at least, all members of a law partnership (or professional corporation) must be licensed attorneys. That's baked into both state law and rules of professional conduct, and is a serious limitation on organization that tech professionals are not saddled with.

Yeah, LLPs/PLLCs might have the credentialing requirements. However, I am not sure law firms have to organize with those structures -- I admit ignorance in that case. I was thinking more generally.