If I was out buying a car, and my partner wanted to buy a demonstrably worse car, for a reason I didn't like much, we would have a discussion about meaningful difference. The last two cars I have bought have not had a rear windscreen wiper. My view: the rear windscreen wiper doesn't matter a damn. Her view: it is essential for backing in the rain. What other features of the vehicle would I be happy to compromise on in order to get this feature next time?
It depends. It's about the customer.
Say you're our car adviser. You might be passionate about, say, carbon emissions - and try to overcome either one of these objections on that score. Or it might be acceleration, and you can argue on that basis. But sooner or later a choice will be made, and all you could do as our 'car adviser' is provide information, maybe some research, then an opinion or recommendation, and try to help us nicely as we go through the debate. Oh, and whatever choice based on our argument about an irrelevant feature we decide to make, you should make sure you documented it all.