I mean calling Actions that need to be installed and not the ones that come with OH, for example, publish from the MQTT Action.
There may not be any difference but I had the comment there to remind myself to test more than just the built in Actions.
The problem I had was trying to figure out how to pass the Class to the method. In Rules DSL I just need to pass OnOffType, for example. I was apparently having a slow brain day because it took me forever to remember there should be a .class on OnOffType.
I can already see that dealing with the differences between Java Types and JavaScript Types is going to be a problem, particularly for non-technical users.
Thanks for the edit and the info!