> Latin language should be become the official language of the EU
It would be more practical, if everyone spoke the same language, but the EU does deliberately not want that. The EU wants to preserve language and culture of its member states and regions. "United in Diversity" is an important idea of the EU.
Parts of the EU say that, then at other times other parts act inconsistently with it. I was just at a meeting of an EU body where it was emphasized that, when considering the language of European patents written in English, courts would deliberately interpret the text as having been written by a native English speaker, even when it was clear that the author was a native speaker of a different EU language, for example, in cases where the author was clearly following a grammatical convention of their native language (eg, in comma placement) that might be awkward or ambiguous in English.
While that might make sense from a legal standpoint, it seems like it makes it risky to hire patent lawyers in Europe who are not native English speakers, which in turn, along with many other similar inconsistencies, does in practice create an EU-preferred language.
nah I disagree. Because a dead language helps preserving the living languages of the nations.
I think the emphasis is on official. That is, it would function as the common language of administration, communication, diplomacy, etc. (i.e., lingua franca), but it wouldn't replace vernacular languages. This was the norm centuries ago in Europe.
One advantage of it being "dead" is that the meanings of terms are much more stable. They don't undergo the usual slippage and mutation of spoken languages. This advantage would be lost if it were to replace existing vernacular languages.