This is a post by Mike Gayette on PTC site.
Informed design decisions need empirical evidence. That involves deep analysis into the way your models handle real-world conditions.
In the past, you would have obtained that analysis by engaging an expert to run simulation studies of your design. The expert would then return a report. You would respond by tweaking your design, sending it back to the expert, and so on. In short, the technology and the processes for creating robust models was out there, as long as you had plenty of time and money.