@nandric,
I can 'only' speak of my 1st hand 'actual' experience, and assuming you are as knowledgeable as you present - in the world of QA - consider this Objective Quality Evidence (OQE). The rebuild of my Soundsmith Paua was delayed because of a work backup that Pete had, and that Peter rebuilds every top-tier Soundsmith cartridge. Retips are unlikely to be performed by Peter (unless there is a particularly difficult cartridge) and the lower cost Soundsmith cartridges such as the Carmen which rebuilds at only $199, are done by his staff. I bought a Carmen as a 2nd cartridge for that very reason, knowing that when it comes time to rebuild the turn-around will be faster. But, for my Paua I am willing to wait for the "Master-Builder".
I can 'only' speak of my 1st hand 'actual' experience, and assuming you are as knowledgeable as you present - in the world of QA - consider this Objective Quality Evidence (OQE). The rebuild of my Soundsmith Paua was delayed because of a work backup that Pete had, and that Peter rebuilds every top-tier Soundsmith cartridge. Retips are unlikely to be performed by Peter (unless there is a particularly difficult cartridge) and the lower cost Soundsmith cartridges such as the Carmen which rebuilds at only $199, are done by his staff. I bought a Carmen as a 2nd cartridge for that very reason, knowing that when it comes time to rebuild the turn-around will be faster. But, for my Paua I am willing to wait for the "Master-Builder".