I agonize over hiring one person. Also, it’s not like hiring extras in a movie. These are skilled workers.
The higher level organization required for an effort like this isn’t comprehensible to me. Like you say, hiring a single person is hard enough... how do you get it right ten thousand times over? This is mission critical stuff, too.
Honest question - do companies tend to over hire in scenarios like this, then design with loads to distribute well so if say... 25% of hires don’t work well, the job can still be done? Is that absurd?
Most high skilled jobs in the world like your neurosurgeon or the engineers at your local nuclear power station assume your skillset based on educational qualifications. Only IT conducts a tech interview on a whiteboard and hires people without proper education.