Delta first class was fabulous a few years ago. The cabin attendant couldn't have been more enthusiastic. He really liked his job. Food was very good and they served several very good wines. Amtrak, by comparison, treats first class paeengers like Greyhound passengers or worse.
Delta first class was great for me right up until. December of 2019 when I took my last flight.
Probably won't be flying anytime soon though.
I definitely agree that most Amtrak service staff treat passengers like inconvenient cargo. However, there are really exceptional SCAs and some LSAs and conductors that really love their work and enjoy serving passengers.