Bullshit. Most deadlines in software engineering are fake. There are some that aren't, but they are exceptions, not a rule. If you're writing all your code as if every deadline is the Judgment Day, you're doing software engineering wrong and not making the right trade-offs.

The unfortunate reality is that there are some engineers who will gladly deliver software 5% faster and 600% worse just because it makes them look good with the management. They justify their behavior by all kinds of BS, but in the end it hurts the industry, their clients and the society at large.

(There is another breed of engineers that will deliver software 600% slower and 200% worse because of overcomplicated design. Yeah, that's also a pathology. But it's not like you have to choose only between these two pathologies.)