A bike mech saying the bike is defective from that insignificant a problem? I think the problem lies with the bike mech, not the bike.
From the pics, I would not call the derailer stretching as too severe. Looks about right, just what I use.
Derailers and small wheels can interfere, it happens on my Birdy... I wouldn't say the bike is defective, not at all. MAYBE it could do with another link in the chain as Bruce sez. Also check the derailer hanger is vertical.