Y up is very common in computer graphic. As for CAD, I know at least Solidworks have the option to use Y up. I think the choice of 3D up axis is related to the

Y up is very common in computer graphic. As for CAD, I know at least Solidworks have the option to use Y up. I think the choice of 3D up axis is related to the expected look direction. 3D printer control software evolved from CNC control software, which is looked at from top down, so up is on the build plate plane. Video game commonly looked at from the side, so up is up. Up is then often associated with Y. And then there the argument about right hand vs left hand coord system...