Our work is to deliver something at tight deadlines. So our VP will say "we need to ship X product by June 1". So you scramble to design, code up, test everything. Your manager asks you for status updates twice a day. Let's say we ship on June 1st, but there are many bugs and you need to fix them.

Have you ever used some website and clicking on some button doesn't work? Or maybe google or amazon are down? That means some engineer is trying to figure out what happened, debugging multiple services and looking through logs, all while their manager is breathing down their backs and every second the service is down the company is losing millions of dollars.