No they aren’t reasonable, because most of those things won’t change because you close the border. We know this because we have plenty of rigorous studies to show us that.
Locking it down to legal point of entries only can do nothing but help.
It's easier to secure a few locations than many miles, you don't need a study for that.
We monitor ports of entry. It's easier if you don't have to monitor the entire border, you can focus more on ports of entry for other trafficking sources.