It's good that we in the UK have our own standards for beehive dimensions, which have existed for so long. When I was even more of a complete ignoramus about beekeeping than I am now, it still didn't take more than five minutes to find out that using Nationals made sense for compatibility with British beekeepers and equipment suppliers.
For an amateur beekeeper, if another standard was adopted, it would actually cost most of us a lot of money in order to follow that standard. Abelo nationals are just right. Their nuc-boxes are actually half-size beehives....relatively expensive but very nice to work with.