For all of the above it highlights that you can’t beat sending the cartridge back to the manufacturer for refurbishment. Note I did not say retip.
I have had my Dynavector Karat Nova rebuilt 3 times - each time it comes back completely rebuilt (including generator) with new test results for each rebuild - output, inter channel separation, optimum tracking weight etc all documented.
If you look at how the original diamond fits into the cantilever, in many cartridges retipping can never achieve the same level of fit - there will always be more glue than in the original. There is an argument for "should you replace the whole cantilever, diamond assembly" in order to maintain integrity. I don’t think retippers have access to precision micro laser cutters that Namiki possess.
On my original Sumiko Talismans with sapphire cantilever/microridge diamond you cannot see the glue at all. Compare that to the famous Garrott retips that I also have there is significantly more glue.