When first learning to build it can be very confusing why some pieces (especially roofs) just refuse to snap where you want them. It’s very unclear what the issue is without any feedback. I propose that instead of refusing to snap to a place with insufficient stability, let the piece snap and instead turn red and give a message like “Insufficient Stability” This way the player knows it’s not a snapping issue (which is what it feels like with the current UI) and they need to shore up the stability. The turn red and give a message functionality is already there, just not being taken advantage of for this situation.