Cartridges and old man

Empirical evidence on Japanese family firms:
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=1777548

I don't care about Persons, I will go for those carts which push the sonic curtain. A Person is no guarantee to get always one of those, some vary extremely in their sonic abilities (Lyra, Koetsu) even when you will always read how much better the latest design is. Marketing has its own rules and the Fanboys follow. Or, when Designers retire, the name will be continued, even when the product is totally different from his "well known" ones ( Takeda, Ikeda, Transfiguration....)
Sometimes I think, a real outstanding cartridge from someone is mainly based on pure luck because he used some parts which create a 100% unit, his next design is good for nothing for same or even higher price ...

Good points Syntax.
IMO opinion that's why God made the Nagoka MP-500.

Where does one learn to build mc cartridges?

At mc donalds.....❓👀