Good points!

Let me add some more:

• In the drop down menu where I can choose which posts of a coummunity are shown, I can only find "Trending", "New", "Payouts", "Muted".
  However, I wonder for example, where I can find (often very precious!) OLD posts? I changed the tags of my old chess posts to integrate them into the new community, but currently I cannot see them there.

• When searching for communities, one should be able to find ALL of them.
  However, @schamangerbert told me one cannot find for example the "Wien Community" (hive-166496). I tested it, and saw he is right!
  So how to search for a certain community? How to display ALL communities?

• I wonder how to sort the list of the people I follow in an alphabetical order, so that it is easy for example to find certain user names in case one is not completely sure anymore how to spell them?