It would be AMAZING if Revit could see the similarities in an Annotation Symbol family or Detail Item family that is in a model already to what is being brought in by transfer project standards, or import views/2D elements, or even copy and paste from another model. My office keynotes details because we link it to E-Specs and I am so tired of needing to clean out 5 versions of the same Keynote family because Revit doesn't see the similarities in them so it creates a 'Keynote Tag1', 'Keynote Tag2', and so on families because we brought in 2 details from another model that had keynotes in them and we already had a keynote family in the model. This even goes for Callout Heads, Section Heads, or Gypsum Detail Items. We always end up with so many Gypsum Detail Items in a project and just telling a project team to be more mindful of this is not the best workaround sometimes.