A PM describes the business needs. Engineering makes it a reality according to technical constraints. I've never seen a PM checking the code from engineering or

A PM describes the business needs. Engineering makes it a reality according to technical constraints. I've never seen a PM checking the code from engineering or investigating the root cause of an incident. And imagine being an engineer working on such a case and having to converse to consumers at the same time. That would be a very poor usage of resources.