My opinion is how "lucky" you are is highly dependent on the dealer and his attitude towards PDI. And yes, they are to do the PDI BEFORE you do your final inspection.
We, like you, had a great pickup experience and have had virtually no issues with the trailer. When we bought the trailer, our first, I had a LONG PDI list I had made. Before I even mentioned the inspection, the salesman said, we can do a walk through friday morning, starting at 9am. plan on it taking 2-3 hours, then go to lunch and we will fix anything we/you find. Amazing, I was expecting them to rush me through.
And yes, we did take 3 hours for the final inspection. Filled tanks, ran everything in every possible configuration we could think of, checked every door, window, blind, fabric, underbelly, even got up on the roof. DW did find a couple of minor fabric repairs needed, and screen door wasn't latching quite right and a few other minor issues.
Then we went down the street for lunch, came back, checked again and we were off.