macOS still supports turning any file into a template, a feature first introduced in System 7 back in 1991.

Just Get Info on any file in the Finder, then check the "Stationary pad" box.

I'm actually quite astounded I overlooked this myself.

I can't believe I never knew about this! This could be useful to some of my workflows.

I just looked it up and here's an official help page about it: https://support.apple.com/en-tm/guide/mac-help/mchlp1341/mac

Wow! That's amazing! Never realized it was still there.