I think the possibility to build stairs would be cool. Game already has a jackhammer that can drill stone. With stairs we could build basements or underground hideouts. Or escape tunnels for example.
Agreed, stairs in my hobo-hut would be badass… but an anoyance to code I’m guessing.
That said I beleave someone(s) is (are) looking into making z levels work and once they do that would be a much easier task. Not only easier but overall better as then we could also go up. This is assuming people are still working on that. Hope they are.