Honda EU2000 parallel operation

Honda may have reasons for advising against something for reasons other than damage will surely occur. Examples are that paralleled generators need to have the same power rating, or that only two generators can be paralleled. We've read multiple reports from users violating both of these restrictions without any reported problems. If having one paralleled generator running with the other stopped caused a problem, wouldn't that create a huge problem for Honda and the users if one ran out of gas before the other? I think it's a safe assumption that this has happened! Similarly, the paralleled generators aren't normally started at precisely the same time. My guess is that the restriction is more likely to be a safety issue, rather than an electrical issue. Notice that the eu2000i's Owner's Manual also says Honda approved parallel cables are "required". How many users violate this restriction without consequence? I personally would not believe a claim that the stopped unit draws power unless someone has made an actual measurement, which is not a difficult thing to do.