Honestly speaking I didn't even knew there is USDT on solana chain too before this post, since Eth fees reached heights almost everyone has been using TRC20 addresses for USDT transactions, with advent of Sol based USDT, transactions would become even quicker and cheaper. On the other hand Indian exchanges obviously don't receive much transactions in Tether that's why they aren't interested in this sort of features. Most of the users on Indian exchanges use it to just add money from bank and buy sell Cryptocurrencies, I doubt that even 10% would have used these send receive features.
That is the irony most Indian only need USDT for converting their INR. Only some P2P exchanges are accepting Trc20 based USDT. But for those who are trading on international exchange this feature is a big saviour. With Solana based USDT the only benefit will be quick transaction.