[gjem97]

>I heard that airliners can't land with a full load of fuel and they have to dump it to land in an emergency

I think the main reason they do that is that way there's less stuff to burn if there's a fire or explosion.

[jingleheimer]

No the main reason is with equal weight it is way harder on the airframe to land than take off.

Electric airplanes are small so it's not as a big of a deal, but it will limit their ability to scale.