One should not underestimate how the "Journeyman -> Master" step is overall also one of gate-keeping. My cousin did his "Meister" as a car mechanic and it was costly (compared to for example getting a university degree in Germany which basically is for free) and he needed to do it, so that he could own his own repair shop (otherwise he would have had to hire a "Meister"). In his Meister-Training he was also exposed to a lot of legal regulations and some training in book-keeping etc, which of course is valuable to someone to whom math never was intuitive.