I mean, that'd be a big screw-up, actually.
The OP said Indian subcontinent.
That's seven nations and countless religions. And a lot of people who do not think of themselves as Indian. You have India, Pakistan, Bangladesh, Nepal, Sri Lanka, Bhutan, and the Maldives. If you only have Indian people working on it, that's actually a massive political statement. Especially if they're also all Hindu. You'd want Pakistani, Bangladeshi, Sri Lankan, and other people working on it too.
I know that on ENworld we should limit our discussion of politics and religion, but I think this is extremely relevant and would factor into any official Indian subcontinent setting - India right now, and for some time, has had a "Hindu Nationalist" government, which has taken fairly extreme actions against non-Hindus. India has a very long history of being a lot more than just Hinduism. As this is ENworld I don't think getting into the details (which are so important we were taught them at school, note, here in the UK - at least at my school) is helpful, but the Indian subcontinent has had and still does have many religions and mythologies, which interweave and interact.
If you produce a book that deletes all experiences and mythologies except Hindu ones, well, you are making a big statement. And if you produce a more diverse book, that's also making a statement, and a statement that might not be popular with the Indian government (if they even heard about it, which I admit they might not).
It's kind of incredible that Islam, for example, despite being a huge part of the history of that subcontinent, hasn't been mentioned, by any posters so far except very obliquely.
Yes, definitely. This would be a much stronger approach I'd suggest. And hopefully it would be a relatively diverse or complex region/period.