For many of mentioned roles, the perfect solution IMO could be limiting them. Either they can be used only limited number of times (like doctor, who can protect 3 times), or they have other limitations. Like doctor, who cannot protect the same person twice in a row. The issues that you mentioned, ATPG, are then not as important.
OTOH, I agree that asking those questions would not hurt anyone, and host can just reject them
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