I follow Derek's philosophy. I'd rather make something as high a quality as I am able (which isn't saying much at this time for me).
I do use a divider and bevel gauge to layout my dovetails, because at my novice skill level, my dovetails done by eye alone look off and it bugs me. There are enough variations (and gaps
) in my dovetails after paring for fit that I can tell it isn't machine made, lol.
My mother deals in antiques, as my grandmother did. Most of the pieces are old enough to eliminate any possibility of the dovetails being machine made, and may of them are done really well. Some have evidence of layout lines, gaps here or there. Most are mid tier or lower pieces, not extremely fine furniture. I don't have pictures, but only on one piece out of about 20 pieces of furniture did I actually see the dovetails and think, "man, that guy was inebriated when he cut those".