Thanks for taking the time to write this long reply!

Hive id tag MUST BE the primary tag ...

I see. However, it's interesting that after changing the tags of some old posts, at first they had actually been displayed in my community, but the next day I didn't see them anymore (and you just gave me the explanation, why).

Create an index post

Thanks for the suggestion!

It's not a good solution to list them all, especially since the number will only grow.

OK, I agree. However I think one should be able to find them via search function using keywords like "chess", "insects" or (like in the case I mentioned) "wien".

About sorting people you follow or followers that's a good suggestion for general interfaces, which list them in the reversed order of follow; you can search or see them ordered from SteemWorld.

Come on, I think that should be an obvious option for steemit.com, too! :)
Actually, some time (years?) ago, the names in the followers list were still listed in an alphabetical order.