Well, sure, they might be standard. But I've never studied Tamil as a linguist, or indeed, as someone in the English-speaking world. So I'm not familiar with the ways the language (or any Indian languages) are transliterated and it's confusing to me.

I have studied Tamil as a Tamilian by ancestry(not that I'm that great at it, or I'd probably get the transliterations), so I do know the Tamil alphabet. So those are much simpler for me to understand, rather than having to figure out which Tamil character the romanized letters are supposed to represent. :-) Mostly, I was just saying it was nice to see the Tamil characters because they're easier for me rather than having to struggle with the romanized versions!