Congrats for the effort and time spent, I read all your suggestions and ,please, hereafter my feedback
Homepage - Not logged In
Your suggestions are very good, but I think keeping the current view is better, it is more attractive. The idea is to get more steemians ;)
to sumup the given three examples, we can add a welcoming video that introduce steemit and explain how to start into it.
Homepage - Logged-In Users
I think we can have a kind of survey and ask all steemians to answer to it (if possible) : kind of "are you satisfied with the current first page shown uppon logging into your account"
Some Changes in the Create Post Page
I like this one ;)
Users should be directed to the user's post page instead of the blog page upon clicking on their username
well seen ;)
On the Communities page, there should be a separate area for pinned posts
Absolutely
Subscribers of the community should be displayed on a separate page
Very good one ;)
Filter for membership in communities
I understand very well your concern, I think we can have a tag or something like public or private community.
private communities target only a special steemians that respond to a certain criteria (as you mentionned as example)