What can be done about it? Tightening the regulatory requirements for manual flying proficiency sounds tempting right until you realise that it can also backfire
The only problem with tightening the regulatory requirements is that the regulatory chiefs themselves are mostly retired airline pilots who are former children of the magenta line. For them it is easier to look the other way. Unfortunately it looks like we are stuck with the fact there will always be occasional crashes caused by incompetents in the left hand seat who simply can't fly. The cost of doing business?