No doubt, but how often do you have to carry a German Shepherd?You will not prefer them if you have to carry them!
The issue is that most often people who brag that their GSD is over 100 lbs have fat dogs. Large specimens do occur in litters from parents of standard size, but it should never be a goal of a breeder.
I pick up my boy now and again just to mess with him because it gives him the zoomies but even my vet examines him on the floor or has a lift table if necessary and they jump in the back of the SUV easily until they are very old.
Like it or not, even very reputable breeders are breeding larger dogs these days since that's what people want. Breeding just for size at the expense of overall health obviously would be a problem but there are a ton of "oversized" to breed standard dogs that are terrific examples of the breed and healthy. I do agree that you see a lot of over weight GSD mainly from a lack of required exercise and over feeding of "treats" imo. Even more so in labs but that's a people problem not breeding for size.
btw, as far as I know, the AKC official breed standard doesn't even include a weight range standard.