I took it from SAC to CHI last month, even riding coach it was a pretty good two days I spent mostly fasted, drinking black coffee while programming in the observation car. It's the perfect duration for a short fast and that eliminates a bunch of the bathroom and food needs, just caffeinated coding with great views. And in the end I've gone from CA to IL for ~$150 with a mountain bike checked to boot.
Something worth noting is the dining car still wasn't available to coach travelers on my trip, only sleeper cars could access it. Vestiges of the pandemic according to the announcements. It felt a bit like skimpflation to me, but they still had the little snack bar below the observation deck available to all.