This has been a fascinating discussion. The conclusion seems to be that a
general purpose fillet/round provision is not realistic.

However I wonder if there are limited cases where solutions can be found, for
example

All CSG objects that contain only spheres and sphere sweeps etc., fillets could
be defined by blobbing, although I think this could be made more general and
intuitive.

The intersection of two conic section primitives, will itself be a conic
section, so that an equation for it could be written for an extra CSG component
in the form of a sphere sweep following that equation. All under the hood of
course!

Maybe there are other limited cases where in the same way an equation can be
written so that the fillet can be defined as a CSG component.

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