Really like your Blogs Bhaskar, you write so well and you did bring out the emotional perspective on musical diverstity
As another perspective, and not with the intent to be argumentative ! while love for music is what creates the demand in the end does that love translate to money the same way would be the question ! If you look at the
economics of it the US market for music is 7.6B which is almost 5 times more than China and 12 times more than UK. the overall music market is pegged at around 15B ..hence more than 50% is the US.
Comparably india is at around 200M which is 35 times lower..hence despite the wide talent and variety, its intricacies is limited to the diaspora.
Of course this talks about the economics and not the love for music , but explains why a store would have more divisions or shelves for its highest selling content and put the lower volume sales content lumped in one shelf
Reminds me of an incident while I was living in the US 2 decades ago. The apartment complex around a km away was predominantly, if not all rented out by Indians and it was at the peak of the dot com boom . So many of them had their parents also living with them. One day an american ( non asian) knocks at a door and asks if a mr So and So ( another non asian) lives their and the elderly indian lady answer " No , there are no foreigners living here "

So for an indian even in a foreign land everyone else there is a "foreigner" even though they may be native.
I guess this is the same for music as well as in america where everything which is not american or in english is "the world" since there is so much of content/variation of music there itself and so little of popular appeal for other music that it can very well be clumped into "World music" and even there the little popularity is due to folks like Ravi Sankar who really took the music to the world and performed at woodstock along with fusion collaboration
Interestingly during some time I lived in Paris, most of their FNAC outlets had a world section alright but with a sub section on india , along with some countries in africa, latin and even china, which had folk songs and classical... this could be since the europeans are more exposed to to "World music"
Since Bollywood music is mostly Pop and also very often " inspired" by western pop, it is not surprisingly is limited to the indian diaspora !