^This. Aero is already fully developed for human-sized riders, and you can only shove so much motor and so much gearing onto an e-bike.
Few years ago we rented e “skooters” in Montreal. They looked like small motorcycles. You could use them on the bike paths, which was a huge plus.
I think the rental was 1 1/2 or 2 hours and we barely had enough power to make it back. We did give them a good workout, including drag racing them out on the island where the casinos are. There’s a long gravel straight maybe over a mile long.
We get back basically pushing the bikes, owner is not happy. Not sure why he expected us to leave power on the table, that’s just a waste.
The next day we rented 50cc Honda scooters. I think the whole day cost as much as the short e bikes. Not a thought of needing refueling. Went all over the place. Fun. They needed a little foot assist to start on the steep hills, but not bad.
Upshot, e bike- fun for short tour, useless for anything long. Not practical for touring a city.