“The military disadvantages of defending my particular “bunker” far outweigh the advantages of bugging out to a different locale.”
IMO you cannot just say any one thing is better than another as a blanket statement. There are a million variables and it depends what happens.
In some cases it will be better to be near a population center. In a localized short term disruption the population centers get aid and protection faster.
In other cases the ‘authorities’ might go farm to farm collecting hoarded food and/or people for the greater good. A few people with hunting rifles may work against a small disorganized group but doesn’t have a chance against an organized well trained military detachment.
Its impossible to be “mobile” for an extended period of time in a mad max scenerio. Simply too hard to obtain the resources to survive and defend against attack.
IMO a bunker has its uses but people should be prepared to relocate. In either case there are events beyond your control which may kill you regardless of which decisions you make.
There are certain emergencies that would also preclude bugging in -
chemical release, nuclear fallout, earthquake, etc.