By that metric we should just pack it all up and call it a day on computing in general; because even despite literal trillions of dollars being spent on it, we still haven't found a way to make it secure.

You can make software secure though since it can be patched. How do you patch hardware if it has design flaws? The whole claim behind these hardware cages is they can't be accessed from outside the cage, period. So IMO, seeing multiple failings of this sort kind of makes me not want to trust it.