The structure in the show ring is not that much different than the working lines....it is the type - the size, more substance and color - that are fashionable. The typical working line dog is critiqued as needing improvement in angulation, shouler, front and rear, length of forearm and croup....these are not greatly detrimental issues in the majority of dogs....yes - a straight shoulder and forearm make a less attractive, ground covering gait than a sloping shoulder and longer forearm....but it does NOT diminish the working ability of the dog! Actual real farm herding dogs are more likely to be working line dogs in Germany as per Wilfred Scheld. There is fashionable structure, ie showlines, and functional structure, ie working lines. There are ranges in both types.
As far as working line dogs as companions, yes - some ARE too much for the novice owner....some are not. The key is finding a dog who is bred by someone who understands what they are breeding, rather than throwing together whatever dogs they own, have handy or based on how many BSP/WUSV etc dogs are in the pedigree. This is much harder to ascertain.
Csabre Sch1, Hexe Sch2, SG Bengal, Lynx, Komet, Kira HGH & Kougar v Wolfstraum ~ Ziberia IPO1 ~ ATB Basha, Kougar & Kyra, Fenja, Sch3s, Cito, Sch2, Danger RH & Alice Sch1s ~Kelsey