Couldn't agree more, I have run into the same things it appears you have and come to similar conclusions. That was what was hardest for me when getting started, there are a billion examples of how to write a chat app, a todo list, etc but none of the examples I came across had, as you call it the "meat of how to build and Angular app with Firebase". I felt like most of what I was seeing was gimmicky and had no real use (on it's own).