This argument seems absurd to me.
I get that in software quite often time is wasted by poor management that otherwise would not be wasted if working unpaid. Well managed research orgs can work at elite levels but they are few and far between.
Airline pilots rack up a lot of hours but get very little "stick time", and what they do get is extremely sedate flying to not scare the passengers / spill their drinks. Their primary skills are pushing buttons on the autopilot and talking in the radio and transcribing clearances.
A military pilot gets more effective stick time. But aerobatic pilots, ag pilots (but I repeat myself), and glider pilots gain a LOT more experience and skill per hour flown than an airline pilot.
I mean, just look at this glider flying lesson:
Military pilots are also professionals, and of the glider pilots how many of the best are trainers. Ag pilots are professionals, as are helicopter mustering pilots who are incredibly skilled. The majority of acrobatic pilots are also professional pilots. I’m not suggesting that great amateurs don’t exist just that a great amateur who has gone pro can often beat one that hasn’t.
I understand the sentiment, on one hand if I was rich I would be able to devote my time into constant improvement, but then maybe I wouldn’t have the same drive to succeed as having my livelihood dependent on the outcome. There is institutional knowledge gained by working in a research org that would be hard to replicate as an independent scientist.