I don't think they have started the construction of hangars and taxiways at CXB. Plus Google images are usually at least two years old. Usually older.
I believe the runway was also widened and lengthened recently which is not shown in your map above.
From wiki,
"The airport is in process of being upgraded to an international airport, in order to attract more tourists,[1][2] which will make it the fourth international airport in Bangladesh.[3] The two phases of upgrading, will make the airport able to provide better facilities for parking, landing and take-off for wide-body aircraft. The whole project is ৳6 billion (US$77 million) project.[4]
The airport's runway currently has been expanded from 6790 feet to 9000 feet, and will be widened from 150 feet to 200 feet. The runway's load capability will be strengthened for wide-body operation, while the runway lighting will also get an upgrade. Equipment such as instrument landing system, distance measuring equipment, AMeDAS and VOR will be installed.[5]"
Therefore CXB has a wider runway (and almost as long) compared to Dhaka.
More importantly - what is your point?
Airbase/airport construction with dual runways in Bangladesh does not get same type of priority as does in a 'fauji' country like Pakistan where a lion's share of the yearly budget goes into defense-related infrastructure. Pakistan more or less is in a constant war-footing, we are not, as far as I can see. Our priority is preparedness and training more or less, which has intensified as the economy has improved and funding becomes available. We also have to balance regional politics in defense purchases unlike Pakistan.
More defense infrastructure (like CXB airbase) is being built but I doubt we will be in a situation like Pakistan to be armed to the teeth for nuclear war. Our economy and quality of human resources development (housing, health, literacy) will take priority at this time so their quality of labor can be eventually used as a basis to improve the economy in a robust manner.
Dhaka (DAC) does just fine 99% of the time with a single runway (14/32 with Length X Width of 10500 ft x 150 ft) and high speed exits and taxiways. One or two aircraft accidents in a year does not warrant the cost of building a second runway. BAF base Bashar at Dhaka is adjacent to the airport and BAF can utilize the runway for maximum utilization and efficiency.
DAC was built in the 1960's and was state of the art then. Until recently, passenger handling at the two terminals was sufficient and did not exceed design capacity. Dhaka's new third terminal is being built (construction will start third or fourth quarter of this year) to double its passenger handling capacity in the interim before a brand new multi runway larger international airport will be built away from Dhaka. At that time DAC will revert to being an airforce facility and domestic operations airport for which it's scope will extend to two more decades. Tons more infra is being built on the airport property such as several five star hotels and convention centers. You probably are not aware of any of this.
Building runways in a mostly moisture-less rocky and sandy country like Pakistan and a humid swampy land like Bangladesh are way different affairs, both cost-wise and activity-wise. So there is no point in comparing these situations.