With scouting the way it’s set up, I think that makes the assistant too powerful of a tool. If you want to target certain recruits (or exclude them, as you suggest, which is in essence the same thing), it needs to be expensive, and that’s what your personal scouting does. Camps and FSS are cheaper, but you have no control over who shows up in your pool that way. The assistant is designed to be the bridge between the shotgun and the rifle approach, you have more control over the content of the pool (selecting radius, positions, etc), but it’s a little more costly.
Years ago, I thought it might be a good idea to let the assistant tether a radius to a certain location away from your campus - say 500 miles from Salt Lake City, when scouting recruits for UConn. But now I think that also makes the assistant too powerful (with the setup and cost as is), for the same reasons, so I’m glad the powers that be didn’t listen to me.