As the European Commission claims on their site, as one of the reasons they chose to create a new license instead of relying on those already available:
> The licence should have equal legal value in many languages.
In addition, the EUPL is not any license text some (from a legal perspective random) people came up with, but the text of the license was written and voted into law by the EU itself, therefore it can and does rightfully claim the following, which is invaluable to me as a FLOSS author residing in the EU.
> any litigation resulting from the interpretation of this License [...] will be subject to the jurisdiction of the Court of Justice of the European Union [...]
So even if the local courts interpretation in my home country falls short, the Court of Justice of the European Union will surely take into account the intended purpose of this license as laid out by the legislators of the EU.