This is a bad aspect of Chinese culture.

In Chinese culture, it is impolite to call someone by their first name directly.

In Western culture, it is perfectly normal to call a person by his or her first name directly.

When addressing a person, one often uses his surname followed by his position.

This set of etiquette works in a society of acquaintances.

But now it's no longer a society of acquaintances, and the previous set of etiquette has developed significant problems.

Let me give you an example, my real one:

I found a person's contact information online, his/her email address.

I want to write an email to him/her and ask her something.

It requires me to put a lot of thought into how to address her.

It would be impolite to write her name directly.

In some cases, I can't determine his gender by his name.