They are NOT the same issue, though they are related.
There is a "Laffer curve," I expect. If college is far too easy, everyone can get a diploma by mail, so no signal value, so fewer people go.
If too hard, they won't finish, and fewer people go through.
They're the same issue.
If you make college harder, fewer people will go and fewer still will finish.
If you make it hard in absolute terms, far fewer will go, and almost no one will finish.