Hi. I have 15 cruises and 200+ days on HAL and I can state unequivically that I have never had a problem finding a deck chair on the ship.
Were someone to attempt to "hog" a chair this way I do believe I would not pay attention to it at all.
The chairs are meant to be there on a first come first served basis. There is nothing less fair to other passengers than to think that the rules, whatever they may be, don't apply to you.