I see what you mean. The devs need to agree on single app as the specimen. In the mean time I onboard android usrrs to Amethyst, ios to Damus and web to iris.
Though  Nostr.how is good for explanation.
Also we have awesome nostr github for onboarding techy people. 

 It’s confusing. The reason blue sky works is because you can go to their website and sign up. 

No reason nostr couldn’t do the same 

 Very good point