English language is predominantly used in the main board of Indian LB but Hindi language speakers probably over 80% of total Indian population that's why it's important that someone who is going to represent the Indian board should be familiar with the most spoken language.
Again, I don't understand why is it important to know Hindu if everyone on your local board is using English language only? I mean, I just went through your board a bit and when I look at the topic titles, all I see is English language.