Professionalism is not an indicator of truth; it’s an indicator of social expectations and values within a particular subculture; in this case the world of “professionalism”.
The world of professionalism is a weird fantasy world.
Nobody gets sick. Everybody is smiling. Everybody is understanding on a surface level and apparently sympathetic. Nobody wants to make waves and likes to play things safe.
It’s a generic baseline status quo that is found in every country on the planet with very little variation.
I suspect it was established by UN and other diplomatic missions, likely originating from British Empire Colonialism assumptions from the 19th century and crystalized after Balkanization