When my rig was new, and I mean BRAND new, had not yet gone camping.. I was walking through the dealer's shop with my service consultant to take a look at why they had not yet installed the baseplate on my towed.. There was an insurance adjuster with us,, We stopped at a water heater.. I looked at it, turned to the service consultant and said "Forgot to drain it last fall did they?" he said "yes".
Just so you know, that is a major cause of income for RV repair places around here.
I do have to say. If I gotta learn what happens when you fail to winterize properly.. That's the way I'd rather do it (With someone else paying the "Tutition" as it were).
Home is where I park it!