Have heard the same reasoning many times before, i.e., "low gun, because that's the same way I hunt" but examine closely your conventional hunting gun "carry" ... is it remotely anything like your skeet or sporting "low gun" position, or is it just the gun isn't "mounted" ???
I've watched literraly dozens, if not hundreds of hunters ( did some outfitting & guiding, both here, and abroad ), carrying their guns afield ... not one has really employed a carry position resembling a "low gun position" typicaly usedseen on the target fields - other than, as stated, the gun wasn't mounted.
Low gun is perhaps a good way to "practice" your gun mounting while shooting targets ... BUT IT AIN'T THE SAME .. and you're really just kidding yourself if you think it is ! Other than International Skeet & F.I.T.A.S.C. (Internatuional Sporting)
where it's mandated, none of the conventional target games require low gun, and none of the top level shooters employ a low gun ready position.
But by all means, have fun shooting "Low Gun". The gun mounting practice can't hurt.