In reply to Ellen.

I think the reason I didn’t use the Core setting options was that this option didn’t give me the possibility to offer borders only on one side.

There's a ticket for controlling individual border sides and border control refinements. I'm pretty sure I've seen it discussed in other tickets too, so it's something that is likely coming.

I feel like you that I wished the Core team would offer presets for more control over these setting for developers.

I wanted something more like Tailwind. For example, instead of letting the user add any border-radius value, we'd have named classes under the hood like rounded-sm, rounded-md, rounded-full, etc. Then, theme authors would define what those values actually are.