Theo, last time I checked, Indic languages are no longer listed in the
side of the English Main Page. A limited number of languages is there
with a link to More Languages.
They are, it's just that Indic languages usually have so fewer articles with different titles that they don't get listed.
See the article for India-
The listed languages on the side include almost all indic languages. There are two issues why they are so few links to Indic language versions, one is there is just a huge shortage of relevant articles, comparing an encyclopedia with 3.8 million articles to most indic languages versions which are ~100k or less is going to lead to a majority of times with no relevant cross-links. The second and the lesser reason is titles themselves are in Indic languages, so if a bot doesn't tag them right they don't get picked up.
Regards
Theo