Actually I’ve found the “old school” thinkers to be equally if not more stubborn.
I remember an argument many years ago (1996?) the day after Ken Griffey Jr just beat the Sox bullpen late in the game, like in the 7th inning. It was definitely not the 9th. Anyway one traditionalist was blasting the Sox manager (Kevin Kennedy?) for not bringing in Vaughn Eshelman to face Griffey. And he went on about how stupid Kennedy was for not using Vaughn Eshelman against Griffey. Yes, the same Vaughn Eshelman all of you forgot about years ago was apparently a lock to retire the best hitter in the entire decade of the 1990s.
I brought up Kennedy should have used Slovumb, who, unlike Eshelman, didn’t suck. At least not that year. In fact, he was the best and only decent reliever the Sox had.
Wow was this suggestion met with condescension. “You have too use a lefty there.” Like it was a rule. Like Griffey had never faced borderline minor league talent throwing left-handed before. Best hitter in the game vs s***** reliever struggling to stay in the majors, and because of his traditionalist strategy, this was a no-brainer, and failing to see that mess to Kennedy needed to be fired that day. And then re-hired just so he could be fired again.
And this was years before sabermstrics went mainstream...