I feel like Americans are all over the place. The top echelons of business in the US are very blunt and direct. The lower levels tend to be very indirect with lots of toxic positivity. I think this works out for capitalism and exactly fits the Gervais Principle.

Brits are even worse than Americans at all levels (hence, the largely incompetent government and the fact most businesses are poorly run - it's literally The Thick of It at all levels).

Indian/Asians are the absolute worst in terms of directness, these are all very strict hierarchies of business that only succeed if the top person is a genius, since they will never be challenged by anyone.

Europeans definitely are most direct of all, so they don't put up with wage slavery, so business leaders can't maximize their extraction of value from labour, but they tend to have better quality of life all around :).