Dentists in Military or college settings get hundreds of hours a year CE without choice. I knew some that got over 500 hours a year.
The military pushes it's dentists to join the ADA and AGD. If after 3 years of membership and having those CE hours why not go ahead and get the credentials.
Now also most general dentists in the military beyond the rank of major have completed a two year AEGD (Army made a residency a requirement to get to LTC). These people take and pass the board of general dentistry and are board certified general dentists.
As a general dentist in private practice in a rural area there is no value in joining the organized dentistry unless you feel good giving money to support dentistry in washington. The AGD and ADA have no rural CE, they do have free CE for people in urban areas. Still many members of the AGD do seek out the credentials of FAGD and MAGD. Those credentials don't impress patients, but if you want to do dental teaching of dentists it gives credibility.
I give my money back to my community and not to a private company like ADA (not a non profit, makes almost a billion a year). I don't give to the AGD to support urban dentists or to chase credential (I did that for a few years and dropped out before the credentials).
Personally, I wish these credentials could not be placed after the DDS and only specialists could put further credentials. The FAGD looks like it implies a degree or specialty when it realy does not.