I don't think including all passport pages has any thing to do with country of origin. This was never mentioned in writing.
Instead it was there in CIC publications (instructions on website) to upload all pages of passport for a while IN THE FIRST FEW MONTHS OF EXPRESS ENTRY.
Latter they revised and its been a while that instructions ask for only Bio data pages. Most people only submit bio data pages and get PR.
Lastly, EE is mostly processed in Canada and i don't know of any COUNTRY specific instructions written any where except for Police certificates (written on website).