Call me old fashioned...
The cover your @rse component does apply in some instances. Met has been known to advertise possible severe hail on the general forecast after several million dollars worth car damage that wasn't forecast.
Met doesn't ever put 30 or 60 minutes holding fuel on. They just forecast the conditions. Since the demise of OPS in the CAA days the only person responsible for fuel is the pilot in command. As for TAFs, they are regulary amended and to assume that they'll only be amended on the 6 hourly schedule is ridiculous. We deal with amended TAFs all day every day. Major locations also receive a TTF service updated half hourly valid for 3 hours.
Obviously people will get caught out but then as already advertised there's a fair bit of PROBability involved.