In MoI, you can manage things like this with "rebuild".

It's always an issue, because, if you design a NURBS curve with only 3 points, that is 40 feet long with only a .01 mean deviation in the point definition, then other calculations in various operations, just dont have enough data to work with. We dont want "everything to be automatically re-evaluated and changed", necessarily. SOme of MoI's tools will do a "fitting process". This can become overly complex in various situations, like fillet patch fitting. :o