This story taking place 1993-1994, Apple would have actually been without its charismatic leader.

Jobs still built the corporate machine and culture. It takes a while for that kind of thing to wear off or evolve.

But didn't his values from his earlier stint kind of set the culture?

As somebody who may apply for a job at Apple in the near future: Because working for that multi-billion dollar corporation means getting to work on possibly the best set of electronic devices on the planet. If I work for a company rather than for myself, I want my work to be contributing towards as grand a project as possible, and if that end goal is valuable enough, working insane hours to meet insane requirements sounds like a fair trade.