If the people spent half as much time building skills as they spent creating, reading and following random "rules" then the climate change, homelessness, tech employment crisis etc would all be solved problems.

We’re talking about spending a couple of hours learning the basics of negotiation for a likely 10-20% increase in salary/equity. That’s certainly not making the difference in solving the world’s problems.

If you’re speaking more broadly than just salary negotiation - I’d just say that humans aren’t perfect machines. We care about solving problems but we also have desire for money, power, status and following random rules.