I agree with all of you guys on the difference you mentioned about DID and DSD. we can consider it a high and low block diagrams. One present the idea in a simple way that any audience can understand the main concept of the product like the DID and the other one should all the technical details for the same project in a very engineering detailed oriented document like the DSD. Also, it’s not only in product management document also in production. it is very similar to the difference between SOP and BOM list, SOP has less information about the product VS the BOM list has all the detail for each component in the product.