People find a place to work and then stick with it, out of complacency or other properties. It’s why employers famously provide minimal raises, and you earn far more if you change employers.
Employers are betting people will rather accept lower pay in exchange for less volatility and perceived risk, and they are correct.
It's important to be _friendly_ at work but that doesn't mean someone is your friend.
As a fairly specialized electrical engineer, I could still find employment at several other companies which do what I do, but I'm not itching to move (been at the same company for a decade). Is everyone on HN constantly shifting jobs?
1.) Small startups die often
2.) People vest their RSUs and realize their employer doesn't value them enough for a refresh so they take a giant pay cut hence start the job search