Advanced researchers write these articles for other advanced researchers in their own field. No matter how good you are at engineering, you will still get lost in a psychology article because you are not familiar with the terminology, methodology and accepted knowledge within that field.
But it is still so important that we engage with research in other fields because it helps us to see connections to other areas of study thereby enriching our own lines of inquiry and understanding how our own research has significance in other fields (and vice versa).