Granted that there are commonalities! However in Afghanistan’s case Hazaras, Uzbeks, Turkmens are more Mongoloid by race (30% Afghans)… and Uzbeks, Turkmens, etc are linguistically Turkic (13% Afghans). So Afghans themselves have little commonality between each other. Same thing with Shia Iran as more than 25% of its population is linguistically Turkic (Azeris/Turkmens).
On the other hand:
Pakistanis speak Indo-Iranian languages written in the Perso-Arabic script.
Pakistanis are mostly Caucasoid by race with some Mongoloid and Dravidoid influences.
Pakistanis share a common geography/economy with close proximity to Indus river and its tributaries.
Pakistanis adhere to the faith of Islam.
Pakistanis share a common history such as under Harappan, RigVedic Aryan, Persian, Greek, Scythian, Parthian, Kushan, Hephthalite, Arab, Turkic, Mughal, etc. periods.
Pakistanis share a similar culture derived from Indo-Iranian and Islamic roots.
This “Desi/Indian” identity is a farce. It is Hindi/Urdu (i.e. UP, Delhi, MP) cultural imperialism. It was the British who created “India” first time in history, and promoted Hindi/Urdu… and in post-independence period have imposed it on others…
Northeast India which consists of Nagas, Manipurans, Tripurans, Mizos, Assamese, etc. have nothing in common with Indians.. They are racially Mongoloids, speak Sino-Tibetan languages, have their own Animist/Christian religions, and share no history with Indians until the British occupation. They should be given independence as they have been fighting for it quite a long time already.
Similarly, South India which consists of Tamils, Telugus, Keralans, etc are Dravidians with their own race, culture, history, language… and have no commonality with Indians.
Not to mention the distinct Sikhs, Kashmiris, Mundic peoples, etc.
1971 was a result of imposing one ethnic group’s language on another one… along with other injustices/discriminations… which our enemies exploited. Instead of learning a lesson from it based on facts and trying to make change for our betterment, disillusioning yourself with a supposedly lack of religious fundamentalism is just asking history to repeat itself (God forbid).
Talking about religious fundamentalism… where does it end… havent we had enough of Sunni vs Shia, Hanafi vs Shafi, Wahabi vs Sufic, 12-Imami vs Ismaili, … with no end of violence and hatred… dividing Pakistanis. Lets respect each others religion/beliefs… keeping it a personal matter… and just sharing the basic tenants of Islam as an aspect of unity among Pakistanis… along with commonality in linguistics, race, history, culture, geography.