Wow Tom. I own a 2015 Raleigh Detour iE and a 2016 Pedego Ridge Rider and I agree with everything you said. But then I bought the Raleigh at just about half the price of the Pedego on close-out for $1,699. I added a BodyFloat to the Raleigh and it improved the bump absorption dramatically and I still use that bike satisfactorily. I took it for a six mile dash tonight, but you're right, cobblestone is no place for that road bike.
Here are some thoughts. If you end up going with either the Interceptor or City Commuter you can't go wrong (Ridge Rider and Interceptor in the picture from a Nashville ride and my Detour iE). If you need the range the upgraded 15 ah battery is worth it, the range is tremendous.
While there's great stuff out there, like you I did a ton of research and I happened to end up purchasing the Ridge Rider and I'll just mention briefly why, and suggest you try one.
First, I decided whatever I bought next I would try to have the battery integrated in to the down tube. The Ridge Rider had that (in picture 3 those two bikes have different ah batteries in their downtubes, 14 and 11.6, but undetectable from the outside) and it is a stout mountain bike; but, to my amazement on a 28 mile road loop in Franklin, TN, it is a premiere road bike too. Between the wide tires and an adjustable air front suspension with 100mm of travel the ride on the road is amazing, I would think the air suspension on the Ridge Rider would smooth out cobblestone very nicely.
You'll also find four torque sensored assist levels that taken together with the 20 available gears are great for any level of work-out you want, one cadence sensor level if you just want to fly using the bike's muscle but still pedaling, then there's throttle only level, and throttle over-ride throughout. While the bike's max is 20 mph, there is a pretty easy to access software setting that ups that to 25 mph (I'll not activate that as you up the chances of a pretty good hospital stay if you eat it).
On the Pedego sub-forum you can see my range test where a buddy went 24.2 miles with 66% battery remaining with the 11 ah battery, there is an out-of-production 14 ah out there (which I have), and an upcoming 17 ah. And of course being a mountain bike the build is very stout. The bike is already set up for a rear rack and I'll get another BodyFloat. At 5'9" it would fit you perfect. At 6'1" I am having to raise the handlebars 4". There's a lot of great bikes out there, just giving my narrative of why I landed where I did. Oh yes, I bought from a Pedego only dealer and the customer service was just amazing.