There is a special kind of commit that "just groups a previous run of commits", it is called a merge commit. Tools like --first-parent can restrict git log/git

There is a special kind of commit that "just groups a previous run of commits", it is called a merge commit. Tools like --first-parent can restrict git log/git blame to just "top level" merge commits. The only real change is that isn't the default in most tools, but they don't have to show the full graph, they could better focus on a specific depth by default.