> The negative effects of my leaving or being laid off/fired on the company of 100k people are, more often than not, not distinguishable from zero. Many folks left my group and other groups I worked in and, invariably, the escapees were barely remembered a few weeks after leaving. The cemetery is full of indispensable people, and I was never told that I was indispensable.

In fact, I'd go as far as to say that having "indispensable people" at all is a management failure. Large corporations that have been around for decades have survived because they don't have indispensable people.

This is why you don't get more money even if you outcode everyone on your team. The company doesn't want a rockstar developer, it much prefers having 4 average devs (where "average" obviously varies a lot based on the company and how much they pay etc.) It's simple risk management: the company knows it can recruit another average dev if it needs to.