I agree on all accounts above.
I have only one customer who gets by with nothing added ... and he is a hefty fellow but not especially so (maybe 250-270). He has turf tire all winter, but works on a short, flat, rough concrete driveway.
Biggest problem area is if you get out of the track you just cut with the blower ... then you can get the turfs up on to fresh, deep snow, where it can be a challenge to move even inches.
You will be well advised to have weight, ag lugs, or chains ...
Brian