It's usually a balance to strive for. Make it too difficult and people don't sign up. Make it too easy and they get in and leave. You have to have some skin in the game so to speak to stick around. But all of that can also be for nothing if there are no strong network effects. 

You should definitely be able to choose what kind of content you see, I think that would make the apps more sticky and personalized. I don't know if relay selection is necessary, would be nice to test with and without. 

So far most of the feedback we have is that it's too confusing. People get hung up on keys, and not sure what they are doing once they are in the app. Some don't recommend hashtags and if you skip following people in onboarding you have a blank feed.