Since the UK left (and Ireland and Malta being the only ones left speaking English natively I think) this problem got less problematic. If it is a foreign language almost for all, the differences are not that big.
Good point, but I am not so sure the UK (or even England, Scotland, Wales and Northern Ireland separately at some point) won’t rejoin in the future.
Artificial languages have the problem that they will end up being spoken only by an elite, which would be highly problematic for the EU, which is already seen as an elite project by all too many people in the EU.
Yes, that is definitely a danger, but of course - the easier it is to learn, the more likely anyone could pick it up. However, I do think it would have to be learned in schools across the entire Union for it to work. Learning Esperanto first allegedly increases a student’s ability to learn other foreign languages, so it would not necessarily come at the expense of other foreign languages. I suspect that has to do with getting used to learning a language, and if that is true, than any sufficiently easy language could serve the same purpose. And something that could strengthen multilingualism in Europe in general (more language-savvy people = more people picking up additional European languages and to a higher proficiency).
Hehe, I get that. However, if adopted properly, it would be a practical language skill, as it would be a language officially in use. Besides, if those studies described above are to be trusted (not sure if they are), it would facilitate additional language learning. But that argument is what you are getting at with your comment on Latin?