They are able to do that. But, unlike the physical world, it's really expensive compared to just building a virtual one first. And then really tempting to just

They are able to do that. But, unlike the physical world, it's really expensive compared to just building a virtual one first. And then really tempting to just use that prototype, or patch it up. If it was super cheap and easy and almost free to build things in the physical world we'd probably do the same thing and just skip the architecture and wing it.