He said the benefits, such as lower borrowing costs, will only be seen over time.
"I would not enter into policy adventurism by changing this right now. It's too risky," Acharya told Reuters in an interview late on Wednesday.
The RBI has by and large been successful in keeping inflation within the mandated 2%-6% range. But the flexible inflation targeting policy has faced criticism recently on account of the high weighting given to food items in the inflation basket which have proven highly volatile.
CPI inflation on average has stayed above the RBI's mandated range in recent months due to supply-side disruptions on account of a nationwide lockdown to contain the coronavirus pandemic.
And despite having spent less in relative terms than other emerging markets on direct fiscal stimulus to counter the pandemic-driven downturn, India faces a bulging fiscal deficit and a steep rise in its debt-to-GDP ratio.
India's GDP contracted 23.9% in the June quarter and is seen contracting by around 10% for the year as a whole.
Some economists have said the inflation targeting framework has had an adverse impact on growth due to its narrow focus on inflation compared with the multiple-indicator approach the RBI previously used, which looked at both growth and price stability.
"A case can be made that India has been a precocious inflation targeter," V. Anantha Nageshwaran, a member of the Prime Minister's Economic Advisory Council wrote in an opinion piece for the Mint newspaper in August.
"The country may have sacrificed financial stability and economic growth in the process. So India may need to re-examine the appropriateness of the IT (inflation targeting) framework for its development needs," said Nageshwaran.
But Acharya suggested India has bigger problems to concentrate on first.
"People say that we are not factoring in financial stability, and I disagree because financial stability involves external sector stability," Acharya said.
"We have our fiscal house to fix, we have the financial sector to fix and the real economy to fix. So for the entire system to get so passionately energised about revising something that ain't broke - it beats me".
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