How do we handle obsolete official subparts?

[Philippe Hurbain]

Origin changes are not the only problematic ones.
Imagine a subfile which contains a surface, and we decide to remove that like "without Top Surface" etc. for patterning.
This also can create incompatibilities with users who directly use those subparts.

Very good point, Steffen. If we want to keep subparts intact then we can't do anything... so I withdraw what I said about origin/orientation.