I think GSDs are comparable in some respects for the general conversation....potential to do harm, they're a decent size, often used for safety/security ..... but I think their temperament is quite different and they are (easily?) trainable?
I feel they could become a replacement well 'ard dog for those that need/want one
BiB - they've already been there ... several decades ago, the breed standard GSD was, quite often, a bag of bad tempered nerves.
A lot were trained for security and had developed aggressive streaks.
That's why the armed forces, police & many security firms used them [& still do, although the nervous aggression isn't so prominent as it used to be].
FYI the military dogs are [still] trained to bite and then release on command.
Quite a few of the forces "rejects" or those animals produced from private breeders went into civilian security ... and they had the reputation of being nasty, bitey dogs. Some security firms in the late 1970s expected their staff to procure the dogs themselves.
At that time, In the same block of flats as me there was such a guy living in a small [2-bed] flat with his family and at least three GSDs. On more than one occasion at least one of the dogs got out. When walking past their front door one afternoon I ended up with at least one dog hanging off my arm - luckily I had a thick & loose coat on, so I wasn't bitten, but the coat needed serious repairs.
At this time, and for at least a couple of decades afterwards, the "hard men" had GSDs, with big choke chain collars, as some form of status symbol ...