The higher you climb the corporate ladder, the more relationships matter.
At entry level, your output is visible. You do the work, it shows up. It gets seen and you get a raise and promotion.
At director and above, almost none of your work is visible. You're not doing the hands on dirty work, or at least in large amounts. You're making decisions in a room with a few people and the results show up 6 months later. Nobody can trace them back to you.
So how do they decide who belongs in those rooms?
They pick people they already know.
Not "know of." Know.
People they worked with and have seen operate under pressure. That person gets the call more times than not over the stranger with the better resume.
The stakes are higher, so the trust threshold is higher. A bad hire at $70K is annoying. A bad hire at $300K who controls a $50M budget is catastrophic.
And yeah, it's political. Not in the "office politics is a game" way. In the "if you make a mistake at this level, it doesn't just hit you, it hits your boss, your boss's boss, and so forth.
So people protect themselves by surrounding themselves with people whose body of work they've seen firsthand.
This is why "networking" advice misses the point. The goal isn't to collect contacts.
The goal is to do good work with good people so that when a seat opens at their next company, your name is the first one they think of.