During the months where there are an average of 10k illegal crossings per day, some would argue that the border is open enough to be porous to about a towns worth of humans per day.

There is, by definition, no illegal crossings when the border is open. So, no, I think your assertion is very ill informed

In good faith, when people mean open, they mean unenforced to the point of 10k people per day strolling in.

No they don’t. There’s actually been a huge problem in that many people come to the border because they’ve been told it is open, when in fact, it is not. The myth that it is open is amplified by the American right constantly claiming it is open on the news.