I get what you are saying but I am from south and I never needed Hindi in my entire life to converse with others either personally or professionally which is why people are against whenever the government is trying to bring Hindi as mandatory to learn. Any language is good to learn and people who needed it will eventually learn and it's not the job of government to decide which one we have to because India is not a country like China, it's something created with extreme diversity that is why we can't really bring one state policy like others.

I have been to other countries where they prefer using their Native language even if they are fluent in English because language is part of the culture too and they embrace it but they will not try to force others to speak in their languages.