It doesnt matter, atleast in this context, that howmany countries are using languages that werent originated in their land. That simply is not the matter we were discussing about; unless u r tryin for a de-tour, r u?.
Now, we are talking about India and Pakistan here. Your argument is that India is using the word "Sindh" in her national anthem which is not part of India anymore, hence India need to update its National Anthem. Now, me on the otherhand is claiming, your NATIONAL LANGUAGE itself have no connection with current day Pakistan and it simply doesnt belong to you. Same with your offical language English. Therefore replace it with something else.
You simply cannot escape from this reality by keep repeating "noun
+verb
+ OutdatedAnthem" sentance allover this thread, hun. You are using something ur neighbour developed, and that is a hardcore fact. So my friend, I would reccommend you guys to re-write your constition and get over it. Then we will see if you have the privillage to say India need to update its National Anthem.