I don't think that a dealer being unaware of a service bulletin is so much a case of poor communication, as it is the inability of the dealer to always be in a position to take advantage of the resources available, and keep informed. Announcements of service bulletins, campaigns, changes in maintenance procedures or schedules, etc., are first announced on BossWeb. Promos are presented here, too. Unfortunately, busy dealers often have little time to browse the Web, and can miss postings, or lag behind. Furthermore, often only the owner or the service manager is likely to access BossWeb. One can't expect every salesman and technician in the joint to be spending their time on the computer instead of helping customers.
There is another wrinkle. If there is a campaign or recall, the bulletin should be linked to your VIN# on the computer when they look it up. In theory this is good, but it doesn't happen 100% of the time, for some reason. In addition, less critical issues are not listed by VIN#. The dealership has to be aware of them. This can happen when they access BossWeb, receive the paper copy (if they have good procedures for receiving them, filing them, and training their employees), receive periodic refresher training, or often when the customer has a problem and the tech calls BRP for assistance.
No, the system is not perfect, and there certainly can be communications problems, but there are logical reasons for them, and I think we have to just be persistent...plus show a little tolerance.