I think it just varies by flight / station, and Delta is still bringing back some aspects. I was on a D1 flight today, eight hours, and the meal service was three courses, multiple pass throughs for drinks, cookie and pre arrival meal both offered, etc. Eight hours. No pre-printed menu though - passengers were addressed by name and when asked about their dinner order (most passengers ordered meals before the flight).

D1, however, has never been an “elevated” experience like some foreign carriers - it is a comfortable way to fly long distances while also earning MQM / burning SkyPesos. It is what it is.