> the US 110v thing is kinda limiting, and 220v is way better

More efficient with copper certainly, but 110V is safer: cf. Ohm's Law. Lower voltage penetrates skin less readily, so you're more likely to escape unscathed from a 110V zap.

In Ireland, on worksites, the corded tools are 110VAC/50Hz (115V, 120V... mains/2 on a transformer-- and 'mains' varies wildly according to my several years of data captures in a range between 214-240).

Speaking of copper efficiency, the British Isles do all kinds of silly things like running ring mains to enable the use of smaller conductors for higher loads on domestic electrical sockets, and notionally to provide a safety factor.