umm interesting:
Chrome apparently natively supports *no* Indic languages (apart from Gurmukhī):
http://en.wikipedia.org/wiki/Help:Mu...support_(Indic)
As for the Mac, it supports Devanagari through two methods:
1) what they call the "Devanagari-QWERTY keyboard", which is not a physical keyboard but a phonetic input method, and
2) A native virtual keyboard, which quite interestingly has 4 layouts: normal, shift, option, and option-shift.
http://deimos3.apple.com/WebObjects/...2618536082.pdf
The virtual keyboard having 4 layouts suggests a reason why physical Devanagari keyboards might not be used, because the language is just a bit too complex for a standard ASCII keyboard. You don't really want 4 characters on a single key, on top of the English ..... that would be up to 6 chars per key, which is too many. Having 4 on my Thai/English keyboard is quite enough !!
But I think we need a Devanagari language expert to let us know whether physical Devanagari keyboards are in use, and also what % of people choose the phonetic QWERTY input method vs the actual Devanagari character input method, and their reasons for choosing one over the other.