Hi Jason - maintaining continuities in multiple directions tends to be used for a kind of advanced NURBS modeling workflow.

MoI is more focused on kind of more core, easier to use broader construction functions currently.

For example for the shape you show there rather than building it in a kind of individual patch-by-patch method, I would probably build it as a single larger rail revolve or sweep, for example with these 2 curves:



I then used Rail revolve to do a surface of revolution that is squished by that vertical rail:




There tend to be many advantages to defining smooth pieces as larger surfaces like this - there are fewer curves that are being used, that tends to make it easier both to set things up and to fine tune things for instance by adjusting curve control points and having the surface update.

And as you can see, when you make things out of broader surfaces it is easier for the surface to be fully continuous.

Even when you have multi-direction continuity tools available to you as in other NURBS modelers, it doesn't necessarily guarantee you a pleasant shape through the entire breadth of a surface, they are more about maintaining continuity right at the edge area. When you do that patch by patch approach it tends to make for more undulations and undesirable shaping happening even though technically there is continuity enforced at all edges.

- Michael