its still in dev, so unstated rules could be a 'figure it out' approach long term or it could be explained at release, we don't know where they are going. But you make it sound hard... you can go X distance from the ground before stuff falls. Items can clip into each other. Crafting station stuff has to be really close together. That is it, all the rules that matter -- I mean you can mention that you can snap or free float, or that there are 8 or whatever rotation angles, but what else?

As far as why you like it .. or not.. people like different stuff for different reasons. I like to build here, and I enjoy most of the other game activities as well like farming, gathering, exploring... some say its all the same, but there are unique places in every map where the terrain and biomes and random placements just work out to make something awesome.