It's not really your doctor's choice to make you wait to see when you can start suppressive therapy. If it's something you are interested in they should be prescribing it for you. You don't have to wait for a magic number of ob's before it's worthwhile. Your doctor is pretty behind the times in her thinking
If she won't prescribe it for you to help reduce ob's, reduce the chances of transmitting the virus to a potential future partner and just for all around peace of mind- then it's time to find a doctor who is more up to date on herpes treatment.