They would much rather confidently repeat a date that is totally unfounded rubbish which will have to be rolled back later, because then they can blame the engineering team for not delivering to their estimate.
If you had a deadline - say thanksgiving or something - and you asked “will the work be done by then” and the answer was “I’m not going to tell you” would you hire the person?
The no estimates movement has been incredibly damaging for Software Engineering.
"I'd like to have my roof reshingled, but with glass tiles and it should be in the basement, and once you are half way I'll change my mind on everything and btw, I'm replacing your crew every three days".
Though the "I'm replacing your crew every three days" does cut a little too close the bone...