An example may be, graphic designer shop gets a contract to update the company 'style guide'. It gets done and there are a lot changes that are cross-cutting w.r.t. components, starting with fonts, borders, margins, border styling etc.

Also, what's not fully clear to me, what if - as usually is the case - the components are nested? Changing eg. font in the outer component would leave inner components fully intact?

A side note, I'm wondering how the Svelte approach relates to `isolation` in cycle.js https://github.com/cyclejs/cyclejs/issues/259 -