There are so many flush celing lights available now, chose different styles for different rooms. A pendant over the dining table always works well no matter the ceiling height. You can hang it quite low. Spotlights on a dimmer switch work better in a lounge as you usually have table lamps and floorlamps. Change it up a bit. I don't think using flush ceiling lights in every room is a problem as long as they are not all the same style. Keep them similar but not the same fitting. Think of different materials too. Glass, wicker style shades or metal.