Why does India continue to be a single country without splitting up into many?

In this post, it was answered that the formation of India was mainly motivated by becoming strong enough to be kicking British. Now, at this point, with no countries going around colonizing others, why exactly does Indian state's continue to stick together as India?

Why would the states want to split up?

More autonomy for instance. As seen in the history post, it is well discussed of the highly varied culture, food choices etc between the different Indian states. It can also be seen by the political parties which are often elected.

If you see the ruling party by state here, you see that different state have vastly different sense of idea in which they want to go into the future with (see).