What really worries me is that everybody who ends up a PI has been through this harrowing process, so it perpetuates itself; just broken people breaking people. A dramatic way to put it, I guess, but I don't know what else you can say about a PI demanding someone come into a lab on the same day as their appendectomy.
As a once broken PhD student and now early PI, je refuse to perpetuate the shattering. I'm still figuring it out, but i can it is very much at the core of my work.