except for english speaking countries whose primary language is english, every country have their primary language and they also speak English, because English is the international language. All the person who held high posts in the government should be able to communicate in english.
But Hindi is language of india and not Nepal.
Nepalese netas should speak in Nepali and wear appropriate Nepali dress while at the parliament, addressing people, or representing our country, That shows that they have respect for their motherland.
Wearing dhoti and speaking Hindi is an Insult of Nepal.