You can query it sure, but that doesn't mean the problem will be readily obvious. Again, this stuff can get complex fast, and it's easy to armchair quarterback

You can query it sure, but that doesn't mean the problem will be readily obvious. Again, this stuff can get complex fast, and it's easy to armchair quarterback that away. So the stack approach essentially doesn't, because it forces a linearization. You'd have to rewind back through and see why what the system did didn't match your expectation. But at least the order is comprehensible vs some of the other approaches.