There is the other side of the coin to consider, how many people really want something like a 45-minute rule enforced?
If we are at a resort, we're not necessarily going to be spending much time sitting in a pool chair, we are going to be swimming with the kids, or going for a walk on the beach, or playing ping pong, or walking around the resort, but you (a) still need somewhere to put all your stuff and (b) you do need somewhere to sit throughout the day,
Having to pack up all your things, especially with young children, anytime you want to do anything is no good, nor is constantly having to watch your time to ensure you're back to the chairs before someone takes all your stuff away.
Maybe they need two sections, one section of prime chairs that are use them or lose them and have very strict rules that are enforced, and then the rest of the chairs be more relaxed for the drifters.