If you step back and look at how most Indian investors are positioned, almost everything in their financial life is tied to the rupee. 

Salary is in rupees, savings are in rupee-denominated accounts, property is valued in rupees, and domestic investments are also priced in rupees. That feels completely normal because we live and operate within India.

However, it also means that the entire portfolio depends on the long-term path of one currency.

If the rupee gradually weakens over a period of ten or twenty years, that movement may not pinch from one year to the next. 

But over time, it affects what your money can actually buy outside India. The impact becomes visible when you look at foreign education costs, overseas healthcare, or even long-term travel and relocation plans.

When you add global investments to your portfolio, you are not trying to forecast exchange rates. You are just ensuring that part of your wealth is linked to another currency. That reduces the situation where your entire financial future is dependent on a single exchange rate.

Currency diversification works in the same way that sector diversification works. It does not eliminate risk, but it prevents all your outcomes from being tied to one variable.

That is why currency deserves to be included in any serious discussion on diversification.