I don't see why it couldn't just be optional for specifics buildings or areas. It doesn't need to be global.
Physics is my single most-wanted feature. I'd be happy with even simple load-bearing that updates only once per minute or something.
there are technical limitations. though i agree in some cases it would be usefel to have pshyics in a very limited area. but as this seems to be technically not viable at the moment it is an either all or nothing approach.
and as long as that is the case i doubt this community would welcome it (i wouldn´t). simply because the building system of rising world is that much advanced that people can literally build everything with it. but physics would put huge restrictions on this again.