A modern, industrial house would never have ornate crown molding (or moulding if you’re British).
image from Great Home Painting
But what about trim along the floorboards or around doors? Contractors like molding because it tends to hide imperfections at the bottom of wallboard. If you’ve ever seen sheets of wallboard at a lumberyard, you know the edges tend to be a little worn and jagged. A little strip of molding will cover that and help out if the floor is a little uneven too (which could be the case with a container floor, like below).
image from Architecture Addiction
Our developer suggests no trim. She says that the metal trays that our wallboard affixes to should be enough. Below is a close-up, pretty bad picture that I took of the Cordell house with the tray holding the wallboard:
I prefer the clean look of no molding, but if it means the difference in cost or extra labor, I can deal with a small (and I do mean small, like less than two inches), square strip of trim in either the same color as the wall or floor, like below:
image from Jetson Green