That is the view of Deobandies, what are the views of Barelwis on this issue ? And what about the non-asian (arab "salafis", "ikhwani",... who are also a major part of the muslim society), do they follow saudia and are they any contact between all these groups to try to have a united 'eid or they don't even look at each other ?
There is a view in the Shafi'i Madhhab on the authority of Qadi Abu al-Tayyib al-Tabari that an international sighting is sufficient. This is a sound view in light of the evidence.