Lies lies lie.... The population of density of Bd in 1971 was 443 people per square mile vs 195 for Germany/ 215 for Japan in 1950. I have used 1950 as a basepoint for germany/japan since that the farthest data available and I am certain that during WW2 it was much less due to refugees leaving these nations.
Chart and table of Bangladesh population density from 1950 to 2020. United Nations projections are also included through the year 2100.
www.macrotrends.net
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Population density of BD being more than twice that of Germany/Japan in ww2. Also remember weapons of 1971 were more advanced than weapons used in ww2, keeping in mind there were no precision weaponery in 1971 such as GPS, infared, etc...
Lastly keep in mind the wars in Germany/Japan did not consist of a militant insurgency no where they supported by hostile neighbors as in the case of India supported mukti bahini.
The closest thing to the independance of Bangladesh would be the American revolution and the US independance from great britain. The difference being the US had much better leadership which did not poison the mind of its people with the fetish of genocide/rapte/etc for 60 years and instead forged even closer ties with its sisterly nation leading to a strong alliance and partnership which defined the world for a hundred years and is still visible today. That is the difference between great leadership and pathetic blood sucking leadership.