This is very idealistic and removed from reality. Most companies are so messed up that there is no coherent strategy, so you cannot require a single product manager to have an excellent roadmap, when the conditions for creating one is not there. You also may be working on a product or area that is far below the high level strategy, so it's goals would be different.
If an engineer really goes and thinks they should evaluate a roadmap like this, that's toxic.
If an engineer really goes and thinks they should evaluate a roadmap like this, that's toxic.