Maybe Britain - https://www.gov.uk/types-of-british-...erseas-citizen

I have no issue with the OCI name. I do think they give it out like candy though, its very generous as it gives right to live and work to foreign born spouses and kids and grandkids without asking for anything in return. The old regime of PIO was painful at times with FRRO registration requirements etc. even for foreign spouses of Indian citizens resident in India permanently

I'm not sure what the confusion is - A green card is a travel document, technically a passport is not required for entry into US by LPR's. An OCI is just a visa in a booklet linked to a passport and they recommend you update it using OCI Misc Services if the linked passport changes.