I suspect the
Michelin 3-star thing is still a more reliable reference, cause it sets a whole (overpriced, luxury) standard and hard competition.
Recently, I saw a report about some chefs mistreating their employees in France.
They're driven crazy by pressure and their rating in the Michelin guide, which is evil.
Sure, great chefs can be harsh when necessary. But going down to beating or burning (literally torturing) their employees would be punished by law if only people in the kitchens weren't so scared to ruin their careers.
There is a lot of pressure in luxury restaurants and hotels. Maybe too much sometimes.
When people go insane because of competition, then it turns out unproductive.
Great chefs are also good managers on principle. Otherwise their kitchens go derailed.