I mean, I wasn't trying to define notability; the question asked was "why does Wikipedia have notability requirements" — i.e. what stops them from just getting

I mean, I wasn't trying to define notability; the question asked was "why does Wikipedia have notability requirements" — i.e. what stops them from just getting rid of the concept altogether, and keeping everything — and the answer to that is to look at the marginal OpEx of keeping a page around.