The CLI is completely optional, you can create stacked PRs purely via the UI.
Also the rationale for having a chain of branches pointing to each other was so the diff in a PR shows just the relevant changes from the specific branch, not the entire set of changes going back to the parent/trunk.
Curious how you're thinking about it?
> so the diff in a PR shows just the relevant changes from the specific branch
That's exactly right.
> you can create stacked PRs purely via the UI
How?
I see from the docs https://github.github.com/gh-stack/introduction/overview:
> When a pull request is part of a stack
How does GitHub determine if a PR is part of a stack? Is it automatically detected so that I don't need to adjust my tooling that already creates chained PRs?