the skill level on EU is, on average, lower than on NA in my opinion. they have some "superstar" players (olwen, leed, some more i cant think of) but your average guy can't block twice in a row
and it's not like the NA playerbase is that much smaller than the EU one, eu has more players yeah but there's lots of na players too, it seems ridiculous to only balance for eu. and the bec not being a problem on EU isn't really a reason to not nerf it - it's not used, fine, but the fact that it's so prevalent, particularly among the "high tier" players on NA should be proof enough of it being abusable