An INR-hedged US equity position costs roughly the difference between US and Indian short-term rates — currently around 2–3% annually. That is the carry you give up to remove FX volatility.
For a 1-year holding period, hedging makes sense when the cost of carry is small relative to expected FX volatility. For a 20-year holding period, the compounded cost of hedging consumes most of the historical INR depreciation tailwind, often making unhedged the rational choice.