The phrase is common in written and spoken English, and adds emphasis on the major factor.

Usage Frequency

It suggests other factors exist, but the one mentioned is the most significant.

Not Exclusive

Can add a tone of gratitude or acknowledgement when crediting someone's efforts.

Commonly used to explain how something is financed or what comprises most of a budget.

It suggests significant coverage but implies it's not whole or complete.

Highlights the main reason behind an achievement or situation, often personal or human-centric.

Used to bring attention to less obvious but significant contributing factors.