I can’t tell you how happy I am to have modifiers back in edit mode. However, something dawned on me while working on a scene with lots of subdivided objects: Now that Open SubDiv is the only choice for the Subdivision Surface Modifier, is Optimal Display gone for good? You used to be able to simplify your scene display greatly by turning on this option. This was really only good while modelling, since animation with Open SubDiv was much faster, but it was a nice feature to have and something that users of other software will be looking for when (not if) they switch to Blender.
By the way, the user manual online says under the Optimal Display heading “See Open SubDiv”, but that section makes no mention of Optimal Display.
Edit: Ignore the manual part…I looked back at it and realized I was mistaken.