Question

Having all units in atomic standarda is more useful.Why?

Answer 1

I think , No !
Because in atomic standard, we have to measure size , shape and nature of very tiny particle which is invisible to see with help of naked eyes.
if you observed , the radius of atom is in order of angstrom/ pico meter / femto meter. Here we generally ignore SI unit of it.

So, according to me, having all units in atomic standard is not more useful.