Marcela,
Any of us has different needs. The only reason I started my e-bike life was the need of improving my health. (And I am actually fond of cycling and adventures). After riding my hub-drive motor e-bike (which does not eat the chain and sprockets much) for a longer while, I noticed that e-bike didn't contribute to my health very much. I went with Vado 5.0 and decided that e-bike would not let me down in any situation, and it let me experience so many adventures. In turn Vado SL gives me what the powerful Vado cannot: fitness.
I'm a a cyclist by heart. The last thing I would like to do is "to be ridden" by my e-bike: I prefer riding it by pedalling. Now, so called Class 2 is in fact a "lightweight" motorcycle. You may need it; I don't.
He could be an engineer (even in the aerospace technology) but certainly not a cyclist.
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If this is "a good design", them aerospace things and all...
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then I don't know what a bicycle is
The thing that does not eat up the chain and gears is called Turbo Vado IGH
Or, a Como SL (but I am not a fan of the latter).