You can get a new home built in Georgian Revival style but it’s going to be expensive. Home builders rely on easy to source, mass produced, standard parts. In my experience the cost goes way up. For instance, a truss can’t be used for the roof and windows are custom, etc. and there’s going to be a lot of windows.

It’s why many homes today are built off existing models. But you see it in higher-end homes.

Now, of course the required parts could become mass produced if there were the demand. And I agree it’s a simpler and beautiful style. But you can’t put a flat roof on them.