Jalib was, in so many ways, the counterpoint to Faiz Sb in the Progressive Writers Movement: Faiz was almost patrician, in spite of the family having fallen on hard times: his father had been a senior aide to the Emir of Afghanistan, Faiz himself was involved in elite literary circles from well before his conversion to the communist cause, had been a Lieutenant Colonel in the British Army during WWII, had friends across the aisle, so to speak, held government positions, knew many of the prominent leftists outside of Pakistan, (none of which of course takes anything away from the years upon years of jail and exile). Jalib was truly proletarian, and this is reflected in his poetry too. It is meant to be sung, not read, the rhymes are simple, and in places it aspires to literature, but nothing more.
Ustaad Daman, sort of the Punjabi-language Jalib, was a dear friend of Faiz, but he would poke fun at Faiz's attempts at truly proletarian poetry. He would say that Faiz had composed an excellent Punjabi poem... in Urdu.
It is sad that people with absolutely nothing to do with the Progressive Writers Movement or even the mainstream left have co-opted both Faiz's poetry and Jalib's. Every time Shahbaz Sharif belts out a Jalib poem, the poor man turns many times in his grave.