Correct - the OP2 will poll every device in a room in response to receiving a packet sourced by any switch in that room. In addition, the OP2 will transmit new links to the room controllers to track room status in response to the switch activation. There really is no need to use the 241/242 links - you just need any link transmitted. If you just set the switch to transmit status, the OP2 will keep everything in sync.
In my rooms that do not have room controllers, I have the single rocker switches set to transmit the room ON link on double tap, but just transmit status on single tap. This lets me use the switch as both a single device on/off, but to also set the room scene with other switches or lamp modules. Standard usage in our house is to double tap off the wall switch when leaving a room. Single tap transmits status, double tap transmits link.