Fortunately, you’re wrong. 
PROATC does work with all other aircraft, it’s just that upon activating the software it asks you if there are any specifc aircraft like PMDG or Fenix etc. You can just ignore that window if you’re flying either a default or another addon.
Consider putting your settings like this for optimum ATC-assistance:
And consider reading the manual for the autopilot stuff. I don’t use that myself, but for ATC the program works very well.