As a Commonwealth inhabitant, having to deal with a multitude of formalized language variants, each with a small number of differences in orthography and vocabulary, strikes me as a useless waste of energy. Difference and local particularity for its own sake may please the odd local jingoist, but it is simpler to simply take the mother version to be definitive.
Taking your point to its limit, all contemporary languages are a useless waste of energy. Let's adopt a terse and efficient esperanto so that the billions can easily conduct business.
That made me laugh! If forced to learn an IAL[1] I'd probably choose Solresol[2] because what sane person could resist the chance to yodel their complaints to Customer Services?
Or, if "terse and efficient" are an immovable part of the specification then I'd suggest Ithkuil[3] ... or maybe Rust?
[1] International Auxiliary Language