They did made a lightweight upright, actually two versions but one could be equipped with an electric power nozzle called the Swing. Definitely alot lighter weight than the S7/U1 and also better than any Oreck in my opinion.
I don't think Miele would ever make a lightweight direct air upright in all of honesty. It just wouldn't make any sense to me of why they should, based on the marketing point of view. SEBO is already off to a slow start of the Softcase uprights, that I think is the best you'll ever get if you want a modern German lightweight direct air upright. And in my opinion it's definitely better than any Oreck as well. Manual height adjuster, clean out port, easy access to the brushroll, and a true lifetime belt.