You're free to use the workflow used by the Linux kernel, but a lot of people prefer Graphite because it is easier to use and integrates with GitHub PRs better.

You're free to use the workflow used by the Linux kernel, but a lot of people prefer Graphite because it is easier to use and integrates with GitHub PRs better. If you find value in Graphite (as many devs do), then you can pay $30 and support its development.