15% increased effect weapon enchant without any downside?

Don't these BIG enchantments bring certain penalties along with them? 200% increased attribute requirements, all sockets are red, etc.
But it seems '-3 maximum sockets' penalty is not doing what it's supposed to do. Should be giving 3 sockets to two-handed weapons and none to one-handed ones.
Or is it intended for some reason I'm yet to understand?