Perhaps that is why I did not know that it does away with all the other consonant variations that exist in hindi and mostly other languages.

it is not so much that Tamil did away with them, Dravidian languages simply have a very different phonemic inventory than Indo-Aryan languages. The phonology of Proto-Dravidian (the reconstructed ancestor of Tamil, Malayalam, Kanada, and Telegu) only has unvoiced, unaspirated stops (link).

Ceci n'est pas un seing.