I'm sure quite a few commenters on here only started writing code in the last 15 years. What's interesting is that git is (more or less) the de facto version control system and has been for that 15 years, and that likely means that what you put in your commit messages will stay around forever (for some definition of forever).

As a greybeard I've gone file-based backups, then SCCS, CVS, SVN, and now git for what seems like forever (git was 2005 according to wikipedia), though probably the late 00s. And migrating from one to the next (yes, quant code from the 90s is still running in 2022, and we have the commit messages to prove it).

Some people commenting above/below above the PR being the source of in depth information. As far as PRs are concerned, it's just another issue tracker, and I've been through the lot, also including various git hosting services). The commits travel with the repository. The PR discussions don't.