I don't know the other fields well enough, but if all your clients end up needlessly detained or admit to things they have a valid defense for, eventually people will notice. It's not exactly the two major sins that will definitely get you disbarred - stealing money and screwing client while representing them - but it's definitely at least incompetent. They seem to not understand that common law jurisdictions are fundamentally different from civil ones, and also, there's quite a bit of difference between how the system evolved in each country. Or that in China what's printed is basically more like a manifesto, since it's almost entirely run by the bureaucracy and personal relationships, and lawyers that aren't foreign-trained and work for foreign firms aren't considered prestigious since the courts are essentially entirely for show.
They need to get like, one jurisdiction, one area in that jurisdiction, and specifically the kind of sub-sections in that area down pat. But they can't train on real material so they will never be able to do so. Their banner testimonials come from non-lawyers and that says it all.