In my experience, HS 1B TEND to be slow guys with decent to strong bat. Some have no real arm. No arm and no speed is definitely not a recipe for success in college baseball.
But there are also HS 1b with a decent to big bat who can pitch, even though they may lack speed. They play FB on days when they are not on the bump.
Our #1 pitcher in HS was one of the latter sort. He was a big kid, as slow as molasses. But he could definitely drive the ball. My son, who was a speedster, could probably have run the bases twice before he finished running them once.
Fortunately for us, HS rules allow you to pinch run for a guy and then let him return. He was often pulled for a pinch runner when we needed a run. And then returned to the line up the following inning.
He actually got a shot in college, as a recruited walk on, at a mid-major D1. But neither his left hand bat nor his left hand pitching arm were good enough in the end and he was cut after the fall.