> I see it as a different flavour of English.
I think you're being very generous there in painting it as some kind of naturally occurring dialect of a culture.
> The document you share is using UK English as the standard to follow
Incorrect. It refers to and compares against Irish English and US English as well, as people would in fact normally understand it. It's not academic or prescriptive.
> In practice we already use EU English, both in official documents and communications, and in casual exchanges.
You can't convince me people are using contorted jargon like 'financial envelope' in casual exchanges with anyone.
These are the problems in practice:
> the European institutions also need to communicate with the outside world and our documents need to be translated – both
tasks that are not facilitated by the use of terminology that is unknown to native speakers and either does not appear in
dictionaries or is shown in them with a different meaning
It's not just a case of 'not recognising it officially' - nobody understands it and dictionaries (of any dialect) don't help.
What is the point of a dialect that only people writing reports, not reading them (the actual people they're governing), understands?