I considerr you better educated than most Pakistanis.
Go through the figures and try to figure out the truth youself about economic status. https://countryeconomy.com/countries/compare/pakistan/bangladesh
BD chose the perfect path, a path of peace with India. We had a lot of problems with them but the two countrie mutually sorted it out. https://www.aljazeera.com/news/2005/8/21/india-bangladesh-resolve-border-row
BD stopped harbouring anti-India rebels and India stopped harbouring anti-BD rebels.
BD provided sea-port to help develop industries in India's North-east, India helped BD industries by providing cheap electricity.
BD and India have good relations unlike some "hawks" from either side on this forum. I have lived in Kolkata and I can assure you BD and Indian bengal have extremely close relation. Unlike the Pashtoon brotherhood, Bangla brotherhood is beneficial to both.
Pakistanis have always seen everything from "defence" perpsective because their masters(PakArmy & ISI( wanted to keep them subjugated. This slave mentality leads to a myopic vision which judges nations only on basis of their military power. Iceland with only 200-strong Coast Guard is a developled modern nation. Defence forces must be proportional to threat perception. BD has low threat perception because it shared good relations with it's neighbour India. Indian and BD CoasGuard jointly patrol Bay of Bengal. BD doesn't have a huge army, because it does not need it. The Rohingya issue has been dealt with brilliantly. If you even fly from Kolkata to Chittagong you'll see a beautiful red-lined island the middle of the ocean https://en.wikipedia.org/wiki/Bhasan_Char
It's the world's largest open air prison where BD has been dumping most Rohingyas.