Funny, but I wondered about this, too.
In travel, my son was primarily a CF, but once he hit middle school ages, he got played all over the infield. A few games at 3B, a few at 2B an few at 1B. Not sure he ever played SS. And when he wasn't playing those positions, he played LF.
Then, when my son started playing in HS, they took half the kids and put them in the outfield and half in the infield.
My son got put in with the infielders.
I thought this was odd. Sort of like early little league or rec ball where you take the kids who can play and put them in the infield, and the kids who can't and put them in the outfield.
There were ABSOLUTELY some talented outfielders in the outfield. But overall, it seemed like the high school was taking the more talented kids and putting them in the infield group.
My son loved playing center field. But they put him in the infield group. After a few practices, they separated corner infielders and middle infielders. My son got put with the corners.
Then, they tried him at 3B a few times and eventually settled him into 1B.
The other thing going on is that the varsity team was looking at who was graduating, when, and what holes needed to be filled. It seemed like they felt like they might need a first baseman some time in the next few years. So, my son played JV first base as a freshman.
He had honestly played first base maybe a game or two in his whole life prior to that.
Fast forward a couple of years and this year, he would line up to take infield at first base and once in a while, the coach would tell him to go work out with the outfielders.
I took that as a bad sign. That they no longer were grooming him to be the starting varsity 1B.
Well, opening day of the varsity season? He was on the lineup card, hitting in the 5 hole and playing left field.
So, honestly, I don't know what goes into this.
At least in the case of my son, he STILL doesn't necessarily have a position other than "outfield" and he's a junior. The coach has also told him to be ready to play some first base if the need arises.
This is both good and bad. The good part is that, like most talented kids in HS, he can play a lot of positions. The bad part is that the coaches clearly don't think he's amazing at any of them. Haha!
As for POs, our team has them, but honestly, with pitchers, they fall into sevaral categories.
We have POs who never bat.
We have Pitchers who bat when they're pitching
We have Pitchers who play a position when they're not pitching and they're in the lineup.
It honestly depends on how well they hit.
The POs who never bat, are obviously considered to be weak hitters.
The POs who are in the lineup are obviously considered to be stud athletes who can hit.
The ones who hit when they pitch? Probably guys who aren't THAT far off the hitters in the bottom of the lineup and the coach can use a D/H to cover for somebody else.
Thing is, we're just not that objective about our own kids.
And a coach is trying to put out a winning lineup. They MAY try to get some playing time for various players if they can.
But making sure that the SS also gets time at right field so he'll be more attractive to scouts? That's just not something the coach is worried about.
I honestly think it's always been this way. You hit the HS pipeline and the coach sees what the team needs and what you can do. They fill out the lineup and that's it.
Obviously, all programs are different. Some more competitive than others. But my son attends a high school of about 1,250 and his baseball team won the most games in the school's history last year. And the kids MOSTLY kept the same positions, but not necessarily. My son was moved from 1B to LF. Last year's 3B is this year's SS. The year before they moved a kid from 3rd to first. This year's starting 3B was a catcher last year.
So, I think what I've observed bucks the trend. These kids play wherever they're needed and where they've shown they can play.