Speaking from previous experience, having the PR title and description become the commit message was super helpful. Many developers would use the PR description markdown support to write detailed PR descriptions, complete with sections, formatting, and links where needed, as well as having references to related bugs or work items included in the commit message by the tool. I know Azure DevOps supports this and I believe other platforms do also, but it doesn’t appear that is an option on GitHub currently. From my experience it works very well, especially as projects get larger. Hopefully this is something that is added in the future.