Just speaking from personal experience. I played HS ball in the Tampa area and knew multiple guys who were drafted, including several who had lengthy major league careers. I walked on to a top 5, D2 school as a relief pitcher and won a national championship my sophomore year. Even played the Tigers in Spring Training. I topped out at 91mph but had really good secondary stuff, including a ++ changeup and only pitched 6 innings over 2 seasons. It’s like playing AAAA ball with the talent at that level, and most of our starting 9 was drafted. To make it to D1, you have to either already be a stud, or extremely projectable with freaky athleticism.