Yeah, I mentioned Quilt in the post! Lappverk is effectively an exercise in "What if Quilt, but you could interact with it using any Git tooling, rather than Quilt's half-baked custom VCS?".
What you get is git-styled patch-series development. Branches on branches where each branch maintains history of the feature.
A git-spice workflow is compatible with GitHub style PRs where a PR depends depends on another PR.
Or pair git-spice with format-patch you can share with developers who prefer patch files. Or take patches from someone and import each patch as a branch, then let git-spice track the stack position.