I had a company I used to work at hire McKinsey to do their thing. I found out about 7pm the night before the big layoffs hit because a coworker pinged me outside of work channels saying he couldn't log into Slack anymore, and that this was it. The next morning, 15% of the company didn't have a job, and half my team's functions (which were business critical, foundational level platforms) were now completely rudderless because they didn't think to check if they were firing the entirety of the people who managed them.