A Willingness to Hire Fast and Fire FasterI think you need to be really careful with this. Treating employees like fungible commodities doesn't really foster any particular sense of commitment or a strong team. It's okay, I suppose, if you're a solo founder (or a couple of co-founders) and you just hire an endless stream of Upwork freelancers to do various tasks and then dismiss them when they're done (or if they're not performing well enough) - but if you scale beyond that, you actually need to treat people like they're humans.
I'm sure it's well-intentioned by the author, but I've seen people really take this to extremes and behave like total bastards - and they didn't start out being bastards, they just began their journey down the slippery slope of sacrificing common decency to pursue the goal of doing what was, they thought, necessary for their startup to succeed. (When you fire someone on the last day before Christmas because "it was a tough decision, but we're a startup, and we have to make tough decisions", you know you've reached the bottom of that slope.)