> as opposed to people explaining how they want Apple to take their freedom away, because freedom is dangerous

May I be the first to reply that I am glad that this works in neither Safari nor Preview.app :)

I don't know how serious you are, but for others projects like this are virtually never a waste of time. There's opportunity cost of course, but that's very difficult to measure. I'm sure OP learned a ton about PDFs in the process, and there is/are no shortage of needs for PDF creation. More broadly they also deepened their knowledge of javascript and other things.