Hey @dolifer Welcome to the community. Thank you for sharing your initial impression and thoughts about Anytype.
It would certainly be useful to change the creation date manually. There is a feature request available for it already, please do upvote ( ) it to show support
There is a request for hierarchical view for sets as well. I guess, this along with Sets from relations would suit your need
This one is for types and relations
and this one is for templates
I’m not sure if a feature request exists for the same Please do search and create one if not already available
You can already do that for custom relations created by you. For the one’s that are built-in, few might still be missing the type qualification