In ENR 1.10
2.1.2.3 For flights to a destination for which an aerodrome forecast is required and cannot be obtained or is “provisional”, the flight is permitted to depart provided an alternate aerodrome meeting all the requirements specified in ENR 1.1 Section 11.7 is provided.
Why would they need say " For flgihts in which aerodrome forecast is required" if as you say they are always required?
If ENR 1.10 says the minimum forecast to a non-IAP destination is a GAF, then this would be a case when a flight doesn't require an aerodrome forecast.
However, one flying to a destination that has an IAP, Clause 2 of ENR 1.1 comes into play, where when planning to a destination with an IAP and TAF becomes unavaiable, an alternate must be planed.
Can anyone provide some additional experience, potentially FIFO IFR charter as discussed in previous posts in flying to isolated non TAF, Non IAP destinations