Simply because the moment you mention a name then it becomes a turkey shoot. One group after another will chime in and you don't know if they are agents/friends/resellers and the whole thread becomes a mess. So when you taking about top german manufacturers there are really only a few and in most cases their delievery issues have already been addressed previously on other threads.
Bottom line is just don't send a $ OS unless your prepared for the potential delay/downside.
Regards,