I suspect that he's more used to have "push" permissions to repositories instead of submitting patches.
I, personally, like to work with patches because this allows me to submit them directly to people involved in the project in cases the project in question requires non-(free/libre) software (written in JavaScript) in order to submit things (of course, I'm **not** talking about Guix). Also, patch submissions don't require accounts in such places as long as you have a way to contact at least one developer by email. Also, I also like patches because people can state their opinions about what I do and even give me some improvement hints instead of having to do various push requests in order to make such improvements.
