However, if you do a serious subject, which is always global, but you do it in vernacular, you are missing out on the virtual global conversations that really matter. It will inevitably force your own contributions to the field to become sub-standard.
France recently decreed that they will prosecute people who post "terrorist" opinions on the internet in French. Of course, France will surely expand their action radius and seek to police any kind of subject, in order to control the "narrative", and make sure that it is favourable to what the powers that be, want you to believe; in line with what they have been doing for ages with newspapers and television.
The UK also want to do that but they face the enormous obstacle of English-language opinions posted from the USA, which are protected by substantial first-amendment free speech provisions. According to Brandenburg versus Ohio, even advocating the violent overthrow of the state, is firmly protected speech. Don't ever say a thing like that in vernacular, because the local-language government may seek to arrest you. Hence, you can expect a much freer discussion in English than in French, since it is unencumbered by national-state regulations that curtail possibly unpopular or anti-government speech. I can pretty much say whatever I want in English. Don't try that in Polish, German, French, Chinese or any other local vernacular.