Yes I agreed I think you can understand them. You are given practical demonstration in observations and measurements and just deny it. Air pressure is not just conceptual. We know how it behaves relative to altitude. In the way it behaves, there is no need for containment, and no evidence for it. But its behavior is evidence for a weighted atmosphere thinning out with distance to a vacuum.

Like with gravity, yes, we can't explain the mechanism per se, but apart from the quantum level, we have the best mechanical description of its behavior in Newtonian mechanics. The scientists can correct me, but it can model projectile motion etc. accurately. Newton and gravity wins in practical demonstration, in predicting the behavior of masses. You have nothing better, but just deny. What an easy position to take, but not honest.