I don't understand this need to hold aviation development hostage to a de facto standard that dates back to (and is derived from the limitations of) pre-WWII technology.
This is a very good question.
Perhaps because the “de facto standard” is based on the laws of physics which are constants, people can learn them starting from primary school, become familiar with them in many areas of life, discuss them freely, they are the same for newbies and dinosaurs, they remain the same from one century to the next, they are natural. The more software you get between the pilots physical senses and the control surfaces the more it flies based on how some one believes it should fly. This is very fluid, the persons inventing it may not document it adequately, other inventers may disagree with it and design theirs differently, it can change between America and Europe and from year to year, as technology changes people may discover it actually is not the best way and a change is necessitated. It may actually not be the best way of controlling the plane.