Explain layering of flavors to me...

If you go into many high end restaurants, they have a little jar of Minor’s Beef Base, as something that the sneak into some dishes at the last minute, specifically for that thickening texture.

No, the examples you gave are fine and make perfect sense. I wish I had a good example but there have certainly been times watching when I couldn’t see what difference the order of ingredients would make a big difference.