Try selling that to a client that keeps using the test against a site that is A rated everywhere else because Google's brand has fooled them into thinking a perfect score means better SEO.
I'd be hard pressed to let stupid things client/managers can do direct how this sort of tool should work. For example, it'd be silly to demand "score inflation" just because your client is unreasonable. Or rather, if a client is making your life hard, I don't think it's the world that needs to change.
What's your solution if your client measures your success by punching their website into https://www.worthofweb.com/calculator/? And doesn't take you seriously enough to listen to you in general?