[pdonis]

As far as I can tell, you are claiming that there is a viable model in which, for example, a charged object moving in an electromagnetic field would have "zero proper acceleration" while an uncharged object moving solely under gravity, would have "nonzero proper acceleration". But such a model can't be right, because "proper acceleration" is a direct observable, and our direct observation is the other way around.

[standardly]

It is so difficult to remotely understand all this when every other term is in "quotes". Of course, I'm not a physicist, so I probably wouldn't understand it all, anyways. I am just pointing out how many dang quotes there are. Could you guys maybe define the terms first so you don't have to put two fingers around every concept?

BTW I made this "comment" by "clicking" on the reply button and then I "typed" it using my "keyboard". No, I don't mean "keyboard" when I say "keyboard", hence the quotes.