Most of the electrics don't have the integral brake in the clutch, so the chain could still keep spinning at full-ish power, as long as it doesn't throw the chain. They are generally weaker motors, but still plenty capable of slicing through a lot more than you bargained for.
Granted I haven't had years in the industry, or handled timber professionally, but I paid for a few semesters at A&M clearing brush over the summers, and have handled Stihls with bars up to 36". I never wore chaps till I had a chain snap and wrap itself up my leg. Ever since then I cover myself in as much PPE as I can.
Also, with those bigger saws, watch the pros and how they handle them. There are a few little tricks/tips that make it infinitely safer to start/use. I always used to free hand it on the start, till I went from a 16" bar to the big boy, and as soon as it started, that rotational energy kicked the bar up, and a lot closer to my face than I cared for. Ever since then, that handle is locked between my legs when I kick it on.
Lastly, I hope it goes without saying, but DO NOT stand on the right side of that big boy.