@12GAGE You are right that STL is being used for many purposes today, but the STL format was originally defined for 3D printing by "3D Systems" back in 1984 (when I started in CAD!) when they INVENTED stereo-lithography. It is a format, that despite shortcomings has stood the test of time -- likely due to its simplicity. It is rare for a format to survive 30 years like STL has.
Dan Staples Director, Solid Edge Product Development