I can't imagine a project so wildly successful and stable that the session URL in a commit history is relevant after 5 years, let alone 30. Git is only 21 years old. I'm not deciding team policies with a multi-decade view.

That said, I wouldn't agree with using the session URL as the entire commit message, or even with letting the session URL make up for other missing details. But to me it's an at-worst neutral change to add it to an otherwise acceptable commit message.