OBD-II is ancient
It predates the Porsche 911 GT1, Windows 95 and implementation of the Schengen Agreement.
I would have thought that SAE would be working to add more diagnostic coverage for features that are virtually essential to most passenger vehicles today, such as ABS, airbags and traction control, but can't seem to find anything.
There is OBD-III, but my limited research suggests that it seems to do nothing to enhance the diagnostic capabilities that are present in OBD-II today.
So are there plans afoot for something that can improve the diagnostic standards across the industry?