If you’re riding it it’s for an experience. Not as a practical realistic alternative to traveling instead of flying.
So yeah, people who believe train infrastructure should be high quality enough that they’re a real alternative to flying for the right distances will not be keen on traveling on the terrible sight seeing focused (I’m being generous here) long haul trains in the U.S.
That about sums up the utility of long-distance train travel in the US.
I can tell you exactly why, in middle America at least. Buying a Toyota means you prioritize reliability and getting work done. Buying a Ford or Chevy (invariably a large cabin, premium leather comfort model wearing a pickup truck as a costume) means you prioritize image. Sure you might get work done with it - though I know way too many who don't - but it wasn't what you set out to purchase. It has to be American, it has to be big and have a fancy grille silhouette, and it has to be nice and cushy to sit in.
I also ride my bike around my city, ride the bus, and ride the train. In fact, not that long ago I did a two week train ride to Chicago; somewhat ironically most of the people willing to make pithy statements about trucks won't ride a long haul train. They fly in planes.