I'm glad you related it to my industry because I can assure you that not every L3 in Google contributes the same value to the company. They have vastly different backgrounds, education, experience, and aptitudes. Some are willing to work 80 hour weeks. Some aren't. Some are very skilled in technologies which aren't in-demand and don't currently generate a lot of value for Google. Some work on projects which generate a lot of value for Google. Some have excellent qualifications but little experience. Some have lots of experience but no qualifications. Some are extroverts and some are introverts. Some are great at communicating their thoughts and ideas. Some aren't. Some are grumpy and surly. Some are super friendly.

There are thousands and thousands of ways in which an L3 is not the same as another L3, and I promise you, no two L3s generate exactly the same value to Google.