Yes, I'm fairly certain that whoever wrote the ATC system and user documentation has zero experience flying.
"As in the real world, any ATC interaction begins with filing a flight plan."
Wrong.
"You need an IFR clearance before you can proceed"
Wrong (there's such a thing as VFR).
"You must read back all instructions from ATC."
Wrong. Just clearances (otherwise, you'll tie up the frequency and annoy everyone).
"At some point, you will be handed off to the center controller"
Well, sure, if you're IFR, though you could also be handed off to a TRACON/terminal controller. If you're VFR, don't count on it. There's also a lot of uncontrolled IFR outside the U.S.
"Continue on your heading and altitude and eventually he will begin vectoring you to an approach at your destination"
If you're VFR, not usually (though they will in busy airspace like NY approach."
And so on.