I sometimes do something similar, as it gives a chance for the CI to run more comprehensive tests on other platforms that's hooked up to the PR flow, and "reviewing" your own code can be pretty helpful.
I think I treat "PRs" on my own projects as pretty much the same as tags or commits - they require pretty much the same amount of documentation and description as a PR to a third party if they are meant to be meaningful to myself in a few years time, after all.
