GDP rebasing is a logical move. But no doubt the timing serves some political purpose I suppose ("look at our $411 billion economy")
Bangladesh is not the same country as it was in 2005. Many new industries have emerged which need to be accounted for. Though RMG retains the lion's share of export. Like most other countries, internal consumption accounts for the majority of the share in GDP. Dependence on imports has declined. People buy BD-made TVs, fridges, aircon, steel, etc, etc. Helps to retain capital within our borders.
A lot of work needs to be done in social mobility. Our human development indices have also somewhat stagnated. Or at the very least, not improving as fast as it did before
HDI will naturally not improve as fast now as the low hanging fruit has already been picked.
It is still going up slowly and that is the main thing.
BD needs to try to aim to get to 1 trillion US dollars before 2030 and then it could say it has achieved something decent since independence as 411 billion US dollar economy for 165 million people is still very small.