When an Indian investor buys a USD-denominated global fund, they are making two bets at once: a bet on the underlying assets, and a bet on the USD/INR exchange rate. Hedging is simply the decision to switch off the second bet. Whether you should depends entirely on which direction you expect the rupee to travel — and whether you want that exposure at all.
For most Indian investors with rupee liabilities and long horizons, the currency 'bet' has historically worked in their favour, because the rupee has tended to weaken against the dollar over time. Hedging it away can mean paying to remove an exposure that has, on average, helped.