What struck me was the absurdly low height of portions of the current fence. they have pushed up enough dirt that it is only waist high.
They also attempted note that you cannot build a wall on every mile of the border. That is irrelevant. As Salena Zito has noted repeatedly, take Trump seriously not literally.
We don’t need a wall across every mile, we need it to canalize would be migrants into areas that either less hospitable for crossing or easier to monitor. That simplifies the task of the Border Patrol and makes is harder for smugglers (of everything, not just people) by raising the cost of doing business and increasing the likelihood they are intercepted.
You can’t “seal” a border, what you can do is make illegal crossings so risky and expensive that most people are deterred from making the attempt.
Salena is worth following.