Would you happen to have something like a github repo with examples of those repositories? I'd be interested in seeing that.

Personally I'm not a big fan of copious extensions. I use them some times but I'd describe my usage as sparingly.

I wish. It's on Github, but my hands are tied and I can't share them since it's someone else's property now (hooray for exits, I think).

It's mostly a thought process...

I have or need something (entity), lets get data about it (repository/extensions), we need to do something with this now (only extensions).

Lots of "static" and "this" involved, but the separation and eventual simplicity makes it worth the effort.

Edit: I tried going through some of them to anonymize some for examples, but it felt like treading in dangerous territory.