I wish companies would figure out a way to have their best engineers do blind-shopper-style interviews where they regularly see if their best engineers would be

I wish companies would figure out a way to have their best engineers do blind-shopper-style interviews where they regularly see if their best engineers would be able to make it through their current interview process. This can be tricky to implement but if done right, would provide lots of insight into the types of candidates their interview process is geared to pass. I asked a friend who worked for years at a large public company if he would have passed the company's interview process at the time that he left. His answer: "most certainly not!". I think his answer is astonishing. Here is a guy who is considered a top notch engineer at his company, assigned to help the company screen for similar top notch engineers and yet, the established process would specifically fail a good percentage of high-quality engineers of the type that already work at the company.