It is all well and good to allow flight deck access to crew, relatives and friends. I still enjoy that privilege on an airline that I fly. On the other hand, if rules are rules and they have to be enforced, I would be glad to give up that privilege to talk to my friend, the pilot.
The more times that the flight deck door is opened, the more chances there are of someone of not my ilk getting in who just want to listen to the radio chatter and look at the dials. There have been too many incidents recently when crazies have tried to get in to do serious harm to the pilots.
I would be willing in a moment to give up my pleasure of the door not opening up one more time for me so that on any off-hand chance they could not get in.