There is always some form of social loafing going on in any large group of people doing work.

"The Ringelmann effect is the tendency for individual members of a group to become increasingly less productive as the size of their group increases."

There is evidence of this in simple tug of war games.

But I think there is also truth in realizing work is mostly performative: the pareto principle seems to apply. 20% of the workforce sustains the other 80%. That's purely anecdotal, I doubt the numbers align that way. But it does always seem there are a few all-stars carrying others.