Is it polite to let people stew for hours, or days, as virtual meetings spread across the company to convey the news in person? It is polite to schedule those meetings all at once with the implications clear - how is that any different than just confirming it an email? Is that better or worse than scheduling such calls with short notice, so that every employee must wonder for days (maybe weeks, depending on staffing and leverage model) whether they still have a job, when that information could have been communicated immediately to allow for immediate preparations?

You and I as senior managers might both apply the golden rule in this situation, but that could lead to different decisions.