You mean you guys cant read our minds after all?!
Sorry for being vague. By “full”, I guess I meant an app level integration similar to what you did with calendars. I generally track my running Tasks outside my notebooks (I never used To Dos in Evernote for example). At the most basic level, I’d like to be able to see my Things to dos inside either my categories and/or projects and link to them like calendars within projects & notes.
At the far end of the dream, is the ability to embed Things lists inside Agenda Projects/Categories with bi-directional management, editing, tracking of them. (Along the lines of how Fantastical can be a single source calendar even though the event you’re editing may be in an Exchange calendar or a Google calendar, etc.
I realize all of that depends on the Things 3 devs playing nicely with Agenda as well as whole lot of work and probably not fully achievable but it would be so nice it if did.