People say that, but I'm not sure its always true. I have noticed the queen will lay eggs in partially drawn foundation and the bees finish the cells around the eggs. They can't do that when working from scratch.
Oh, yes they can. I have 2 packages I hived May 1 and both were laying eggs in the combs when they were barely started. It was nice to see eggs in the 1st row of cells that are less than a 1/4 of an inch deep. It is actually more natural for them to lay eggs in comb as it is drawn from scratch, feral hives have to do it and bees on foundationless frames will do it too. How quickly the queen starts laying eggs in the comb is one of the items I use in evaluating queens.