So often I am editing lines or polygon edges, and need them to align to other, more accurate features like parcels or roads. But I don't want to be editing those features at the same time.
Currently, as far as I know, the Align Edge tool only works with a topology, and Map topologies only work with editable features. So I have to make parcels editable, and just be very careful to click only the boundaries of the feature I want to edit. But when the boundaries are close together it can be hard to tell which one I'm clicking on, so it's not uncommon to accidentally move the wrong boundary. If the Align Edges tool just let you align editable features to non-editable features, it would save a lot of time and headache.