Addressing someone differs addressing from nation to nation.
Would you give an example?
Say Americans. They like using first name in any relationship.
Even to call their boss?
You said it. In their opinion this helps make their communication easy.
And their interaction in the workplace is more equal.
En. The British also use first names most of the time.
But I find some Englishmen are not good at remembering names.
So they will often use no names at all.
Our Chinese seem to value titles.
So do German and Italian businesspeople. Addressing them only by first names would be unpleasant or even disastrous to business.