I still don’t understand why more companies don’t do interviews that include solving real problems that their engineers have had to solve (or will solve), modif

I still don’t understand why more companies don’t do interviews that include solving real problems that their engineers have had to solve (or will solve), modified by some or more of the following factors: 1) domain specific knowledge removed so someone without company proprietary data can grasp it in an interview 2) code setup, library installation, all the time consuming fat removed 3) some level of repeatability and possible algorithm space so different candidates strengths can shine. How hard would this be to do?