Well, I have already explained to you. You won't understand it because you have no idea if Bengali Mentality.
Let me tell you in short
The language " Bangla " was banned from court by Hindu Rajas who adopted Sanskrit over Bengali. After Muslim conquest they reintroduced Bangla, Thus making it the prominent language alongside Farsi.
Most of the Bengali books of Middle Age was commissioned by Sultans not Rajas.
After East India Company Seized power, They strengthen Hindu position in Bangla weakening Muslims by taking Wakf properties mainly because Muslims refused to accept English.
Thus Hindu writers flourished and Bengali Muslims turned into a nation of farmers fishermen etc.
The Bengal Renaissance started by the Hindus in 1800s in the absence of Muslim intellectuals, also benefitted by the establishment of Press in Kolkata.
Muslims of that Era worked hard, very hard to claim Bangla Back. Most of the Bengali Muslim writers of 1900-1947 were trying to reclaim Bengali.
Most of our notable writers were from that era. And Pakistan chose a wrong time to assault on the very foundation that we were trying hard to proclaim.