I've owned several FWD EVs in what I'd consider the wintery parts of BC (snowfall of 8+ meters anually) and the amount of times I got stuck as a result of not having AWD can be counted on one hand. Good driving habits and high-end winter tires are much, much more important than having AWD or not.
That said, the times I did get stuck were mostly a bit annoying if not embarassing (due to holding up traffic). Only once (while climbing a steep hill) did it actually get a bit sketchy due to backsliding, but that happened to every vehicle that had to come to a stop on that hill.