I agree. We lost two of our worst performers to FAANG companies. They were both junior and came from top schools. Communication was a huge problem and both wrote very sloppy code. We would assign trivial tasks to them that would take an average developer 30 minutes or less and they would struggle even with heavy mentoring. I was the mentor for one of them and I really tried my best, but there was little improvement over several months and luckily they moved on.

Now I'm mentoring two devs who didn't study CS in college and only completed a coding bootcamp and they're working out amazing.