While I too look forward to that day, at least for awhile longer due to physics, we are going to continue to have “rounded cylinders”. The main reason for this is very simple: Pressurized vessels. If you look at any type of air tank, and there is a reason they are a certain shape. The moment you do any type of “point” or “edge” it becomes a weak point in the design.

That said… you can always make a really large pressure vessel and put things inside…