I got your link from an older post about Phoenix on HN. It’s really well done (as some replies to you on the older thread said)!
Have you, by any chance, tried Hammerspoon (hammerspoon.org)? That seems to be tool with a broader feature set compared to Phoenix. I was looking for some kind of well analyzed and written comparison.
I have not tried Hammerspoon but I've skimmed through their docs, I'd say ultimately it boils down to: do you want to write JS or Lua? And do you need any of the Hammerspoon-specific features? I personally don't know any Lua and actually quite like writing JS, I don't think I need any of extra features HS provides, and with Phoenix you can still run a shell script and still achieve many things HS provides explicitly.
Have you, by any chance, tried Hammerspoon (hammerspoon.org)? That seems to be tool with a broader feature set compared to Phoenix. I was looking for some kind of well analyzed and written comparison.