Is the vinegar for the taste? I was told to cook hot for 10 mins then turn off heat and leave the lid on for 10 mins. Usually comes out pretty good. Twice as mu

Is the vinegar for the taste? I was told to cook hot for 10 mins then turn off heat and leave the lid on for 10 mins. Usually comes out pretty good. Twice as much water as rice. Rice cookers must be popular for a reason though?