Agreed. Except that it's the freight railways that generally own the trackage in most (all?) places where it's shared with Amtrak. And the freight railways generate significantly more revenue from that trackage (about $75B annually vs $3B).

Not to the freight line companies owning the networks (Apparently there is a law saying that Amtrack has priority, but enforcing it has as of now just lead to years of lawsuits, without useful results)

There's also the small detail that it's the freight companies that actually own the tracks in most cases so they make the rules.

Sure, but the freight companies own the track, so they prioritize their own trains.

Not if you look at the money tied up in the cargo, vs the fares refunded.

Presumption would be it's much harder to stop/start a freight train vs. a passenger train.