Mechanically, the Shimano 11-34 and less common 11-28 7-speed freewheels are the best ever that I am aware of. The fact that they have 11t top gears is icing on the cake. But no matter how good they are, if you run them in the 11t most of the time, you'll chew them up along with your chain. Think of the small sprocket as a "turbo boost" to be used sparingly when circumstances dictate.
I took the 11-34 freewheels off a couple of my bikes and replaced them with inferior 14-34 units, just because the lesser freewheels would still do the job and I could set aside the out-of-production freewheels for worthier purposes.
Adding high speed gears to a crank drive e-bike would be an example of a worthier purpose.
This is to express my gratitude to Justin of Grin Technologies for his extraordinary measures to save this forum for the benefit of all.