Let me give you a summary at history of how Sindhis were before and after the coming of PPP as a political force in power.
Before 1971, there was no Sindh province as Pakistan was under one unit system and Karachi was separated from Sindh before that. Sindhi language was banned in education and administration from 1948. Demographic changes in nearly every urban centre of Sindh during partition, where Karachi, Hyderabad, Mirpurkhas, Sukkur, Khairpur, Nawabshah, Tando Alhayar and Tando Adam became Hindustani Muhajir majority cities. Quota system for Hindustani Muhajirs which made their majority in bureaucracy of Sindh. Sindhi’s were basically orphans with not even a separate administrative unit to call their home.
After 1971 as soon as PPP came in power, it drafted a constitution where Sindh was made a separate province with Karachi as its capital.
Sindhi language was made official language of Sindh and revived in education and administration, where from 3 class to 12th class Sindhi is an compulsory subject in private schools, In 1998 there were 47,444 schools in Sindh out of which 36,750 had Sindhi as medium of instruction. There are billboards, documents such as FIR, CNIC, B-Form, Land papers etc can be made in Sindhi language. Language would only die if we let it die. All attempts of Hindustani Muhajirs failed at others from abandoning their language except for maybe Punjabis.
Urban-Rural quota system was introduced which ensured Sindhi majority in bureaucracy of province.
18th amendment was introduced which gave more autonomy to provinces and Sindh local bodies act took away most of powers of Hindustani Muhajirs.
We’ve come a long way.