MLB teams are developing young players better than ever. We’re seeing kids come up from the minors and have an immediate impact much more often than in the past. Consider that, in the 2010s, there have been 188 rookies who put up a +2 WAR season. There’s still one year to go in the 2010s too. Only 174 did it in the 2000s and only 145 did it in the 1990s. Teams are quite good at player development.
That includes the Yankees, of course. Within the last few years their farm system has produced Aaron Judge, Gary Sanchez, Luis Severino, Gleyber Torres, Miguel Andujar and others.