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There are several things from the history which you should note.
Firstly, the British knew that East Pakistan would be a lame duck (with over 1000 miles of hostile Indian territory) in the middle of two parts of Pakistan so there were serious considerations given to a "United Bengal" as the 3rd country in the subcontinent, so the 3 parts would have been:
Calcutta would have been the capital of "United Bengal" and this was NEVER going to be acceptable to Hindus. This partition of India would have been meant ample mix of Hindus and Muslims in all 3 countries which no part having dominance.
Due to not have having a "United Bengal", you are left with India and Pakistan with refugee movements and solidification of Hindutva.
East Pakistan was NEVER going to last and it did not.
However, what is a fine testament of Bangali tilt to Islam is that despite India pouring all resources into carving off East Pakistan, it became an Islamic country instead of a subservient part of "Bengal". This is a serious point to note! Bangladeshis have a common culture, language etc with Bengal (India) BUT they chose Islam! First thing they did after 1971 is FORCED Indian Military out of their country.
There are two distinct phases in the history of Bangladesh which are Pre-2015 and Post-2015.
Pre-2015 there was a genuine Pro-India tilt in Bangladesh. Narendra Modi has destroyed it.
People of Pakistan DID and STILL consider Bangalees to be their little brothers, note the coverage of U19 Cricket World cup (last week) and see how it is covered in Pakistan.
Pakistan and Pakistanees did not say "Bangladesh won the U19 Cricket World Cup"...they said
"Little Brother beat India"
The military relationship from Pakistan and Bangladesh has always been FANTASTIC as Bangladesh Armed forces have their DNA in Pakistan. After Modi and the Rohingya crisis even the most sombre Pro-Indians like Sheikh Hasina have realised their tactical limitations. Sheikh Hasina is Pro-India because India gave her refuge but now she is subservient to the Bangladesh military which has excellent relationship with Pakistan.
The people of Bangladesh have also changed since 2015 and there is 100% Pro-Pakistan tilt due to Islam. The youngsters in Bangladesh & India are changing and becomes more and more Islamic.
Modi has done for Islam what I could not dream was possible, Alhumdolillah! Modi has proven the two nation theory (Hindus vs Muslims) in Indian and Bangladeshi Muslims.
The key difference between India and Bangladesh is that "Deobandees" in India were Pro-India and Anti-Pakistan while Jamaat-e-Islami and Deobandees in Bangladesh were always and are Pro-Pakistan.
I am genuinely concerned about Indian Muslims and not Muslims of Bangladesh because they are on the right track while Indian Muslims still need to wake up to the realities.
The issue which remains for Bangladesh is its geography, huge borders with India and climate change. It is beyond their means to fix either. People of Bangladesh are shard working and have created an economic miracle but the situation is dire and it will drag their economic progress back into the abyss.
My mother tells me every year people in West Pakistan, people used to make clothes for Eid and then sell it and donate to East Pakistan became of flooding. People in (West) Pakistan do not remember any year where they did not donate vast amounts to East Pakistan due to flooding, monsoons etc
I am sure that in 2020 the situation is catastrophic.
This cannot be undone and I am sure it will be greatly appreciated.