User experience with Nitrokey HSM2 for a root CA

Yes.

In general we would like to improve our documentation and we do so continously (You may notice that we just restructured large parts of docs.nitrokey.com a few days ago) . But I can’t promise that we are going to create the single-document instructions you are looking for anytime soon. Instead it’s more an ongoing improvement. I noticed your vote for this topic.

Tooling should also improved and in particular m-of-n is on my personal top list.

As @sc-hsm explained, these improvements need to be prioritized together with tons of other tasks on our roadmap. This is why you and others of the community are needed to help and improve documentation and tools, for example.