I thought they have Euros in common.
I'm not sure these entries are too hard for Sunday solvers; my feeling is more aesthetic: how many unrelated foreign terms, in this case seven, should a solver expect to see in a puzzle? Some might argue that many foreign terms in a puzzle is to be expected as the world shrinks and we become more multicultural. Others may feel that using foreign terms adds to a constructor's lexicon and so makes puzzles both easier to make and more enjoyable to solve. As stated here before, only common, well-used foreign terms and expressions should be used in English Xwords.