I think the federation was more about interacting with other instances. Like creating issues and pull-requests without needing to create a new account for every instance.

I think this would be useful, as reporting bugs on GitLabs can be annoying if you have to create an account first.

Searchengines don’t index all (of what I need) of the Fediverse and also the UI is not made to see when and where it was posted.

How far do you want to intrude into the privacy of your daughter?
These people: YES!!

The collections don’t have rules as you can’t post directly to them. If the collection mod don’t want to have military tech in it, they would have to remove tech from the list of aggregated communities.

This could be mitigated by sorting the posts by votes and activity relative to the community-size.

Kbin had this once. If I remember right, it was called Collections. The Mod of a collection could add communities to it and their content would show up in one list.

If I’m not mistaken, I think OP meant switch from daylight saving time.