That's a good question. But you need to start from the fact that people have actually tried really, really hard, rather than nobody having tried at all, and it in fact hasn't worked despite rather substantial investment. When you start from there, you may obtain some useful understanding. Perhaps even useful understanding that will lead to solving some of the problem. I've got no problem with people jousting with windmills, I just think that anyone who wants to take such a task on really ought to research previous jousting attempts first if they want to succeed (as opposed to just doing it for fun).
But if you start from the blatently false presumption that you're the first person to ever dream of data that can just flow between systems, well, yeah looking out into the world you're going to be confused at what you see.
We have in fact tried the "correct" way, and it turned out not to be correct. Whereas what we're doing now, however annoying it definitely is, does in fact at least partially work.