because this constraint build the mirrored curves in its operation
and I expect that when I delete the constraint I'l be asked
if I want to delete the mirroed curves also (an option its nice no!?)
Sometimes I feel better mirroring the solid body created by the sketch instead of mirroring the sketch and creating another body from that, but I realize that is not always possible.
Let's just say that we opted for consistency and leave it at that.
And to that point, there are other situations where additional curves are added to a sketch as part of a 'constraint' operation such as when a curve(s) is offset or a 'Pattern' of sketch curves is created. In those cases as well, deleting the constraint does NOT delete the additional curves that were part of that constraint scheme.
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Digital Factory
Cypress, CA Siemens PLM: UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.