Kids aren't born knowing the Roman alphabet either. These cards are for four-year olds!

Nothing special, probably not even the hardest out there to learn. But that's still requiring some effort, just like learning any alphabet actually. Greek somehow kept prestigious place in academia, so it's just more likely going to show that friction in the face of those who are there to learn completely unrelated matter for which using different alphabet is superfluous.

That just reminded me I have a teach yourself devanagari by practicing book waiting for me.