[Elhana]

Why not just leave them open for some other people who might find them useful, but never accepting them?

[gus_massa]

Ten year later someone will post it here, as a proof that the maintainer of the project is not doing his/her "job".

Also, I remember a case where after some time someone decided that since the maintainer was not answering, it was fine to add insults and threats.

[tshaddox]

Surely having a disabled or hidden pull request button is also very solid proof that the maintainer is not accepting pull requests.