Some SF operations in the recent past have been inappropriate to the task and for example, the commitment of the SAS to attack certain low value targets was a problem in GW1. Why use sorely stretched SF resource to down Comms masts when the paras or other like minded vandals are more than capable. The average para can break an Anvil after 5 minutes toying with it !
I suppose part of the answer is the back handed compliment that Joe Public likes to hear the job is in a mystic, but safe pair of hands; no bad kudos for the politicos in charge either in uniform or grey suits.
The spotlight on the activities and roles of SF for political brownie points is also unwelcome.
Ex Grunt is up there when it comes to the tools for the jobs too !