As you stated in your post that you refer to, YOU assumed. We have a saying in english that is meant to be a joke. "Assume only makes an ass out of u and me." I hope you take this in the humorous spirit it is intended, I am not poking a stick at you. The meaning is that assumptions usually get us into trouble.
I am not a cartridge designer, nor do I repair them, nor do I know the intricate details. All I really need or care to know is that if you send your cart to the factory it will come back as the designer intended it to. If you go somewhere else it will probably be a little different. So If you wish to believe that I'm being less than truthful there is nothing more I can do.
I didn't know Koetsu made a $1500 cartridge, but that line has never appealed to my tastes. I did send my $5000 Dynavector to a retipper once and I know others who have sent even more expensive carts to retippers. It doesn't make them or me bad people. ;-)
I now represent Dynavector and a few other products. I felt I should represent Dynavector in the way in which they intended, and I have the money now, so I sent my XV-1s to the factory so that when I demo Galibier, Durand, and Dynavector they all sound as their respective designers intended.