Cramer,
The typical width of MTB bars is 780-800 mm, meaning "very wide". As long an MTB is used properly, that is, on a mountain trail or single-track, very wide handlebars are beneficial. First of all, these allow leaning forward, which helps during steep climbs (the rider does often not need to stand on the pedals). Wide bars make an MTB more maneuverable, too.
Vado and Vado SL handlebar width is 680 mm, and it is very proper for that kind of e-bikes, especially after the bars have been raised. I see no point in shortening these bars, although some people do it. Now: If you wanted to ride upright, you should have bought Como or Como SL. Vado/Vado SL with raised bars allow the Moderate riding position; normal riding position on these e-bikes is Forward, which helps riding fast because of less air drag. NB: I'm not raising the bars on my Vado SL, and ride Forward. I lost body mass and such riding position is acceptable for me now.