Discussing edge cases is just the way to find out if a concept (either a technical model or a qualitative worldview) is generally applicable.

Especially if those concepts are touted as being all-encompassing, holding without exception or being superior to other concepts.

It's true that it doesn't affect our day-to-day life. But I think it is important in the context of being an informed citizen (and, more fundamentally, an ethical person) to have an understanding of different moral systems and the philosophy of ethics. I recognize that this is a personal opinion though, so I won't try to force it on you.