Sketch Mirror is a useful tool but I recently found that its current behavior can lead to problems.
Mirror is often used based on the intention to create a "flipped copy" of entities, similar to what you get in other modelling software. In Fusion, the mirrored image is apparently constructed by applying Symmetry constraints to the source entities. What you get is an extension of the original entities and in certain scenarios that is great, as alterations one one side update the other. If the intention was to copy a complex set of curves as a template and then make some slight tweaks, this is not a great approach; the unnecessary computation of symmetry and other constraints on curves like fitted splines brings Fusion to its knees.
I could manually delete constraints after Mirror but that could lead to errors where more objects than desired are selected and also deleted.
My proposal is to have an option in the Mirror command dialog that will create the selected curves in a reflection but not constrain them.
