Basically 250.92 states that all non current carrying metal parts associated with the service conductors must be bonded.
(B) gives you methods of assuring that bond. The key to bonding bushings may lay in the last paragraph:
Bonding jumpers meeting the other requirements of this article shall be used around concentric or eccentric knockouts that are punched or otherwise formed so as to impair the electrical connection to ground. Standard locknuts or bushings shall not be the sole means for the bonding required by this section.
If you encounter concentric or eccentric knockouts you must somehow bond around them. A bonding bushing is a common method of doing so.
I find it best to look at each component, the riser, the meter socket,, the service disconnect, and all interconnecting raceways and ask "is this properly bonded". In the case of the raceways, if one end is not bonded as as noted in (B)(1)-(4) and you have concentric/eccentric knockouts then a bonding bushing may be in order.
You also need to note 250.97 references you back to 250.92 for >250 volts to ground, however, the exception makes that far less of an issue.