This says nothing about the matter at hand. The concept of category is useful, regardless of its impreciseness.
And some categorizations are better than others.
> Nothing’s in the same category when you look deep enough into them.
That’s also patently false: many things belong to the same category. Everything that exists belongs to the existent category, for example.
> Nothing’s in the same category when you look deep enough into them.
That’s also patently false: many things belong to the same category. Everything that exists belongs to the existent category, for example.