I disagree.
If batting your best player 2nd matters, and you seem to imply it does, then why wouldn't these numbers matter, even if just a little?
Career OPS vs RHP
.871 Devers (.996 in 2019)
.861 JD M (.793 in 2019)
Career OPS vs LHP
.995 JD M (1.381 in 2019)
.750 Devers (.744 in 2019)
The 2019 differentials are huge! The differential vs LHPs is monumental.
Numbers when a righty or lefty starts:
Career:
Devers: .871/.737
JDM: .873/.948
2019:
Devers: 1.004/.728
JD M .853/1.116
I understand those who feel players get "comfortable" batting in just one slot, but I've never agreed with that.
When you say it's gonna happen now
When exactly do you mean?
The #2 slot had traditionally been the most neglected spot, so yes, it's important to have one of your best hitters in that slot. JD and Devers both fill that criteria.
That said, batting orders on the whole are not that important. Flipping 2 guys around 2 spots doesn't make enough of a difference to value splits over consistency in the line up.
Any data to support "consistency in the line-up?"
I get the whole "the line-up makes little difference" position, but if putting your best hitter second is shown to help a little, I can't see why figuring their splits into the equation wouldn't matter, also, especially with the massive split differentials between Devers and JD.
I've never seen any studies done on players in a consistent batting slot vs being moved around. Most players have been moved around their whole baseball lives- just less and less as they advance to the majors. Even once in the majors, all but the very best players get jacked all over the place, and even many of the best of the best move between 2-3 slots over a season.
Prove me wrong.
When you say it's gonna happen now
When exactly do you mean?