Who said worshipping on this night is only done by South Asians? Have you travelled? Arabian Peninsula? East Africa? Even if all Ahadith on it are weak their collective strength makes it strong, this was noted by even Salafi Scholars like al-Albani and al-Mubrakfuri, Ibn Taymiyyah himself said the Salaf used to worship on this night. Im sure you must have read articles for it? or are you completely oblivious to them?