These are not that impressive. Islamabad can not be compared with other mega cities of South Asia due to it's small population(1 million) recent founding(1960s) and planned city build on barren land. It is most accurately be called a bureaucratic and diplomatic town.
Only thing I find impressive to look at in Pakistan is DHA and Bahria town in Lahore. Karachi's DHA and Bahria town have good roads, but not much else. Military elites have taken thousands of acres desert land there and built some fancy roads. May be in future, enough rich and middle class people will move there to make those lively towns.
As I said before, Bangladesh's development needs and priorities are not the same as Pakistan.
We need to build multi-billion Dollar worth bridges, which you don't. We need to spend a lot money on flood control and river management, which you don't. We have less mileage of expressway than Pakistan but we have constructed a larger road network in Bangladesh(369,000 km) than Pakistan(264,000 km) despite 1/6th of land area and 30% less population to connect every village with towns and cities.
We electrified 99% percent households with national grid connection. In 2020 this number was 96% in Bangladesh and 75% in Pakistan.
Access to electricity (% of population) - Bangladesh, Pakistan from The World Bank: Data
Our 98 percent of children are attending school compared to 56 percent in Pakistan.
ISLAMABAD - Pakistan has the world’s second-highest number of out-of-school children where an estimated 22.8 million children between 5 to 16 years of age are
There are many such different paths taken by these two countries. So, if you taunt Bangladesh why it does not have anything like DHA and Bahria town, I have no answer.