Hello 
I agree with you. The usage of FIDO2 is not easy and not so well documented. You have to do lots of web search for yourself to get an idea how to handle it.
I still did not use the key for any of my purposes I thought I could.
E.g. Bank Account login, Web-Shop Login, Email Login. It’s for now only a fun tool which is not the intend I bought it. Anyway I try to improve my skills.
The libs you also need to install for a rpm based system I posted in this link .
The GUI tool is for now not really usefull for me too and the command line tool offers much more options.
So well I hope the documentation of this - indeed nice product - will be better soon.
Best
T.L.