Viability is much more precious than explainability.

It's much easier to explain how something that is known to work works, than to decide if something that is not known to work will work.

The real world is extremely hard to simulate in our heads, they simply don't have enough space to incorporate all of the swirling interlayed feedback loops, many of which are outside of us, to know which ones will be strong enough to overcome other ones.

But once you know it works, you can often figure out, with some study, why it works.

That doesn't necessarily make you much better at figuring out, before knowing if it is viable, if it will be viable.

You can explain lots of things that turn out to not work.

And some things that turn out to work are hard to explain.