Interesting. I'll probably add some form of github and/or reddit support in the future, and I don't feel comfortable adding those URLs unnecessarily, so at somepoint there will be permissions updates anyway ¯\_(ツ)_/¯
Requesting additional permissions without an explanation accompanying it can cause confusion, users may think that the request is unwarranted, or that there is something wrong with the extension. They may also decline it out of habit, given how extensions are auto-updated during the browser session, and the request seemingly pops out of nowhere.
See the version adoption[0] for one of my extensions, 1.1.0 has requested additional permissions. This may be problematic when you are trying to deliver a critical update that requires new permissions.