[Question] Templates working out of the box v. placeholders

Many (almost all?) templates work out of the box, i.e. there is sample app code so the template deploys the first time without users needing to add code. I just ran into the newer [AKS template](https://github.com/sabbour/aks-app-template) which has placeholder files for application code and so I couldn't just test deploy to start before I added my code. Is there a style guide for the templates such that they should "work" without additional code? Especially in the AKS case, a simple Kubernetes app isn't really simple so I still haven't been able to test the template deployment.