Your last two lines is an argument for the splitting of the divisions.
If you're on a wrestling team that pulls from 500 or so kids to build a team, it is highly unlikely you're going to be fortunate enough to have a wrestling partner that can push you on a daily basis and almost impossible to have another kid in the room close to your size that can push you at all.
So when you get to go live against a guy that has the good fortune to attend a school where having a 3rd string is the norm, you’re typically going to get your #### handed to you because you’ve been practicing daily against Norm the bookworm who’s dad made him come out or Bubba the farm boy that’s trying athletics for the first time in his life. Or better yet, the closest anyone in your room in weight to you is 60 lbs heavier or 25 lbs lighter.
Surely even the most adamant against the split can see the advantage of having multiple partners near your weight. On top of that if you’re fortunate enough to have talented wrestlers near your weight you are definitely going to get better than the kids who can easily pin everyone in his room.
I understand it’s an individual sport and you can get better by hitting clinics and camps and wrestling off-season. However I also understand that iron sharpens iron and if on a daily basis your iron is going against wood when you run into other iron you’re really not as sharp as you need to be.
The above doesn’t even begin to include the advantages of having a superior weight room or any other advantage that can be gained by having more money in your program (such as a high quality coach).