I get around on an acoustic bike, but have a lot of friends with e-bikes. I believe this is extremely locale-dependent. For instance there's relatively little bike theft in my locale, except around the university where it's just really easy pickings.

I think you can learn a lot by looking at how bikes -- acoustic and electric -- are already being parked and locked in your district. For instance my daughter is attending grad school in a big city, and while we were walking around, I noticed that the most decrepit old bikes were secured with giant U-locks plus chains. Hmmm. So my daughter rides a bike of similar ilk, and secures it in a similar fashion.

And I noticed the most beastly of chains and locks in New York City.

Plus, people generally seem to prefer e-bikes where they can take the battery pack with them.