Tech Experience
Over about the past decade I have been focused on product management in eCommerce and given that i've both worked in several roles and contracted for a number of large players... I have had the opportunity to see how many companies approach the same set of problems (efficient warehouse, fast delivery, onsite conversion, etc).
The more you see, the more you can compare
When you see how different companies solve the same problem differently it gives you the opportunity to compare and contrast. And I would say there is rarely ever a cut & dry correct vs. wrong way. Each way or each system has its own positives and negatives.
And the more you can forecast potential issues down the road
But it is this experience having seen how many large players have done it that gives me the insight into the problems you are likely going to have with various approaches and how to solve them. It also gives you insight into how to avoid certain problems. Problems that often end up being very very expensive... because let's face it. Building software is very expensive.
I would say each of these companies below is probably best-in-class at something
In this chart below you will see some of the systems I have used and projects I have been involved with over the years. I would say that i learned very useful things in each of the companies... and each of these companies was probably best-in-class in at least one thing.
And therefore the more you have seen, generally the better you can make decisions.