Is this actually a new thing? I was under the impression that carriers and captains have taken the jetstreams into account when planning their routes for decad

Is this actually a new thing? I was under the impression that carriers and captains have taken the jetstreams into account when planning their routes for decades and it is systematic. Cabin announcements have mentioned this already in 1990's: "Ladies and gentlemen, our flight path takes us today further to the north so we'll be passing Vorkuta and approach the Lake Baikal from north before entering Mongolian airspace. This way we can utilize tailwinds and our estimated time of arrival in Beijing is about half an hour ahead of the schedule."