One Size Fits All

Today's Appeal To Faith question posted by Alex (see below) brings up another question.  What is the fallacy of thinking that "One Size Fits All."   That one explanation or solution should be given for all persons or cases, on the premise that we must be consistent, even when the circumstances are different in different cases?    Alex's question asks whether if some scientist or other authority is unreliable, why shouldn't we distrust them all?

Appeal To Faith Question:  If someone doesn’t “believe” what scientists say about evolution, the shape of the earth or climate change because there’s no proof that they’re really trustworthy, and then I tell him that we should trust them regardless, am I committing the appeal to faith fallacy? What if this person then says that, to be consistent, you should also believe in what self-proclaimed prophets say?

One example of this that comes to mind is the Covid restrictions and mandates that apply to everyone, whether they're in high risk groups or not, and whether they've had Covid before or not  (and in some jurisdictions, whether they've been vaccinated or not).