Why do we need a Census at all?

 The objective of a Census is 'almost' accurate population count.

But now, we have the Civil Registration System which tells us how many births and deaths there have been. The entire machinery has been tailored to ensure that no birth or death can go unregistered. Succession does not happen without death certificate. School admissions and even Adhar card does not happen without birth certificate.

There will still be cases of unreported or unclaimed deaths, unreported births in remote parts of the country.

So, can we not optimise the usage of national resources by using the CRS data for metros and urban centers, and using the state's Census machinery for remote areas, where there might be lapses in reporting?

What do you think?