George Carlin has a famous comedy bit where he states "It's a big club and you ain't in it" [1]. My own feeling is that guilds of all sorts prioritize exclusivity for the purposes of bestowing power on some select few. As the article states "Master’s were few and far between". This is similar to how luxury brands maintain their high value: exclusivity. The standardization and guarantees of quality seem to be secondary to the pyramid scheme nature of ascension within these organizations (in the same way that the quality of luxury goods is often secondary to their exclusivity). It reminds me in some ways of the concept of "familiars" in vampire lore, humans who willingly toil away for their masters hoping one day to be elevated to the same level.
It is a complex topic because of the positives and negatives of these systems being highly intertwined. To this day in Canada there is an apprenticeship system for trades. However, it is no longer an inner circle of masters deciding who gets the special status, it is a regional qualification body with clear guidelines, training, testing and certification.
As a society we haven't at all gotten away from the degenerate aspects of guilds. Think of the association with the "golf/country club" crowd. Or things like the Skull and Bones [2] type organizations at elite universities. Or when people joke about the Illuminati. This article is arguing for that by presenting a rose-tinted-glasses view of the past.
1. https://www.youtube.com/watch?v=Nyvxt1svxso&ab_channel=SkyEc...