If you're asking what I'm thinking you're asking it's for logical organization, to get the input values assigned to the correct instance variables for each peer object, on the host. You can see the tags being utilized in event 49.
Associating object with peer, as far as I know, simply destroys that object when the peer leaves the room. I don't know if there's any under the hood optimizations for syncing or interpolation benefits to associating an object.