Not "seems" but is ... Yadong looks cleaner than Mumbai will be in a thousand years.
The problem is Bhutan can't allow it because they are a protectorate of India ... so it would basically be a road to nowhere.Need to have a road from Yadong to Bhutan.
The comparison with Bombay is odious at best. It would hardly be as densely populated and there would be no mega-slums like Dharavi or filthy red light areas. Bombay isn't just Nariman point.