Agreed, however, most folks have a BFH, but not all will have an extender pipe "aka cheater" large enough in diameter to go over their wrenchs' handles.
And while I'm not certain this is really a factor, perhaps the shock when the BFH is used helps break things free?
Peace,
Jeff
First guess is someone used a heavy dose of pipe dope. Heat the fitting while keeping a wet rag on the pipe. Remove the torch and hit it with some penetrating oil. Reheat as above then try again while the fitting is still hot.
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