Probably because of things like Github Actions, which uses YAML. The correct thing to do is use the .yml (like 15 lines) to execute a script of some kind, that

Probably because of things like Github Actions, which uses YAML. The correct thing to do is use the .yml (like 15 lines) to execute a script of some kind, that does the real work, and can more easily be tested, changed, and used on its own. But many people instead start writing more and more in the yaml files to do what they want, and they're left with a mess that cannot easily be run outside of github actions, so then they test it less, or other teams build parallel processes to do the same things but locally, etc