Hey andreasbossard 👋 we're still collecting feedback on the challenges around displaying lots of components but not actively working on introducing subcategories to the product right now — we'll be sure to keep this thread updated if anything changes on this.
Regarding the workaround of using H1s, H2s, etc. — we are also looking at some smaller tweaks to improve how the page outline (table of contents) appears on smaller screens so it's not quite as hidden. (On larger screens, it's open by default.)
Our showcase is a good place to start for inspiration from others but am also really keen to hear how others are solving this problem right now. We'll add any insight people can share to our notes on this.