Has there been any research on this? It seems a pretty common pattern to have the gov't capital, financial center, largest population center and largest GDP producing cities all be the same place. This holds true in (more or less) stable industrialized countries like France, Japan, S. Korea, etc. as well as in many 3rd world countries.
I have a vague feeling its unhealthy, but that's admittedly probably at least partly because I grew up in the States, where it isn't the case and gives me something of a bias against it. And presumably there's a reason its such a popular model, even if it hasn't been a conscious decision in most cases.
I believe I took this reflex by moving to 4 different countries. It makes it easy to notice locality-based bias. But I always wonder how people learnt, when they notice a potential political or environmental bias.
It's just that I'm more familiar with the exceptions than the rule.
Delhi was built as a new capital by the British Raj, taking over from Calcutta. Beijing's history is long and complicated, but it has been the capital of unified China since 1421, give or take a few blips during wars.
I don't know if that's still true or if Indonesia has made progress in recent years in balancing out the political power.
Keep in mind that Indonesia is a large archipelagic nation so wherever the capital is, chances are its "inaccessible" to the majority of Indonesians.