1) Correct, there is no other way than by experiment. If it works as expected during the experiment, I would say there is a 99,99% chance it's going to work unless one of the app is updated/uninstalled or another one installed.
2) That is correct.
3) In case you have troubles with "incompatible tools" which you can't solve and you are not sure if the service is (or will be) working for you correctly, I would say the Internet commands are a better choice, yes.
Filip