"AppGet uses YAML files instead of scripts; we call them manifests. Using data over scripts just seemed like a much better choice."
So it's an opinion, one that the WinGet team decided to go with as well. Okay... not sure that's massively compelling just because the author says so but I'm willing to be convinced. I guess I need to go back and dig deeper on this scripting being referenced in Chocolatey: isn't it just powershell scripting?