Maine allowed a special license for hygienists to do extra procedures, including cavity drilling (if a real dentist is in the building). It is going fine so far.
I think of those guilds more as the most effective unions in the world. The reason lawyers, doctors, pilots, etc... are paid so well is because they’ve successfully limited entry into their fields. They’ve all got arduous entry requirements, and you can’t operate without the unions blessing. It’s simple supply and demand after that point.
Senior pilots for the major carriers are reasonably well compensated though not usually at levels that the typical FAANG developer would get out of bed for (likely $100-200K). Many regional pilots earn less than $50K and first officers less.
Partners at big city law firms are obviously very well-compensated. But the glut of lawyers has been something of a story in recent years and employment difficulties/low salaries for graduates of second and third tier schools are the norm.
Neither of these professions are examples of highly constrained supply except to the degree that there are only so many ex-military pilots and Ivy League law review grads.
The quality of life hit is huge being away from home, sitting all the time, working nights, solar radiation, and having to work your way up in seniority in an industry that has a lot of ups and down.
Sure — but I think the original argument — that the pilot's union has artificially kept pay relatively high — is valid. Truck drivers have a very similar job but worse compensation (especially comparing senior workers).
With all due respect to the folks who drive 18-wheelers, flying a passenger aircraft and operating a truck require very different levels of training. Relatively small mistakes in operating an aircraft can have very serious consequences for large numbers of passengers.
Example: crew reacted incorrectly to autopilot problems following pitot tube obstruction by ice on AF 447 and stalled the aircraft, leading to death of all on board. [1]