I have been playing with project templates and noticed a behavior that seems dangerous to me. If I create a template that has a map with layers in it and I use that template to create a new project, instead of just referencing the original data ArcGIS Pro creates a copy of that data in a new geodatabase with the same name as the original. There is no warning it has created this copy. If you are paying close attention, you will not realize you are working on a copy of the data.
It would make more sense for the template to reference the new project and maps back to the original data source unless otherwise indicated via an option or something. I should point out I am working entirely with file geodatabases and have not tested this on an SDE database.