Hello stan laurentiu !
First of all, thank you for your warm words about our software! Let's review your questions:
1) Any content ... - correct, all content from Space / Group belong to "parent" as it is "better" to them
2) Why isn't there a Top Persons ... - there is no universal solution and we want to keep the possibility to developers to add own variants of "top" areas
3) What about a My Followed ... - you may enable the proper blocks via Stuido->Pages app
4) I know about the Glossary module ... - it is a little different than Wiki. About Wiki integration - we don't have plans to do it, so this area is free
5) About Karma - some developers have the Points system in plans, so watch the news here.