I’ll try actually answer the question and get hated for it I’m sure rather than circle jerking something to the top. But I think it goes like this.

Imagine you had a ball and a cube. Then everyone agrees the ball is a ball and a cube is a cube. Been like this as long as anyone remembers.

Then suddenly someone comes around and says one of those cubes is special and is actually a ball. Then everyone agrees that person is mental. Years go by and more people start saying that some cubes are balls and you feel like you are losing you mind. You know what a ball is, everyone knows what a ball is! How can anyone say a cube is a ball. People attack you for it. People say you are wrong that you are hateful, horrible but you know! Surely everyone knows this is a joke.

They started painting cubes to look like balls and everyone acts like they are balls. But you know they aren’t balls.

You are happy to group them on different measures. Sure some balls and some cubes are red, some are yellow. Both balls and cubes can be spiky, sure balls are more often spiky but there is nothing wrong with a spiky cube. Each to there own. Most cubes are smooth but some balls are smooth. That’s fine.

There are a million and one ways to group these shapes. But at the end of the day a cube is a cube and a ball is a ball. Anything else is madness and you’re not standing for it. You can group them however you want, choose whatever is the most important, fine is doesn’t matter. But don’t say something that is obviously a cube is a ball and what is obviously a ball a cube. You can’t change the definition of a cube to be what that shapes feels it is, that’s meaningless. It defeats the purpose of the word. Sure make a new word but don’t use that word.