General help

For #1, Moodle has the most advanced features and best support. For #2, I am not sure what you are asking. Moodle is programmed in php. For #3, maybe that a person is new to Moodle and doesn't know how to create a course??? Or maybe the instructor doesn't know which tool works best? Or maybe the instructor needs to learn how to use a tool? For #4, I am not sure. I have been using Moodle for about 10 years. Some people might question whether open-source software will die. I don't see this happening with Moodle, but it might? These are just some of my ideas.