I really think the number 1 thing about being a good potential gsd or owner of any working breed imo is just having a desire to do stuff with the dog. The type of owner that has the most issues are the people who get a gsd or working breed dog because they like how it looks and then they expect it to act like some sort of piece of art in the house and dont really care for it outside of feeding it and taking it outside to poop or maybe the rare occational 30 min (if that long) walk.
They really need more than that to be fulfilled. It is a misconception that the gsd is space intensive. They are time intensive. Most days my dog spends most of his time chilling in a crate. When its game time we go HAM. Thats all they really want. To go HAM with their buddy.