If openinframap can be trusted, there are quite a few HVDC lines across India and China already, some in US, Canada and Brazil. It's not just the international

If openinframap can be trusted, there are quite a few HVDC lines across India and China already, some in US, Canada and Brazil. It's not just the international underwater cables that use them. Not sure if avoiding large transformers is sufficient reason for using HVDC lines. HVDC conversion stations still need big transformers in addition to giant semiconductors and other high power electronic components which aren't exactly cheap or widely available either.