Overall 4e is trying to AVOID the golf bag syndrome, so really I'm not all that inclined to be nice to power gamers trying to play the system.
In the case of bracers and shield, or neck slot items, it's not playing the system.
It's following the written rules, no different than following any other rule written in the PHB. It's obvious that the designers wanted the players to have the option for multiple items in the same slots because they wrote three sentences on it.
This is only true for item slot items and then only for items where there is not a physical limitation. It is not true for rings. There, putting on 3 rings will disable all of the rings.