If there exists a scenario where it fails then yes, it is impossible. Just because something works the way you intend it to in some specific case doesn't mean it works in the general case (and the general case is what matters here.)

If it works in a specific case it isn't impossible.

I agree that its the general case that matters. Impossible is a very strong word though.

How wide do you want to cast the 'general' net? You can still have limited scenarios that are useful. You don't have to model the entire universe.

The GP's claim is that yes, it is _literally_ impossible. He cites a source[1]. If you have a disagreement with that theorem then by all means, share. Right now you're just saying "Nah I don't think so", which isn't very convincing.

[1]: https://www.chrisstucchio.com/pubs/slides/crunchconf_2018/sl...

That article gives an example of the Scotsman and Englishman.

Each are equal, 25% get 1200 on the sat, there is no allocative harm.

It is therefore fair, no?

If it is _literally impossible_ I must be misunderstanding something. Because I don't see the things he's mentioning as being mutually exclusive.