Neither you or the original poster made any sort of case for why announcing a set release time is better tor business
Not better, not worse - they haven't given it any thought, because again, they don't give a shit about your experience.
Coolblue, the site I mentioned earlier, only communicated 2 days ago that they wouldn't even get 200 consoles, after they had over 80.000 people register as interested.
You think they only knew 2 days ago how many consoles they'd get?