As I understand it: A992 was born out of the Northridge Earthquake. You had a bunch of plastic hinge formation assumptions based on A36 steel with a minimum yield of 36ksi yield but no maximum, and by then a lot of A36 was coming out of mills at 50-60ksi. So...plastic hinge assumptions weren't quite right. A lot of seismic performance issues ensued.
A992 sets a maximum yield stress so plastic hinges are easier to predict and seismic performance can be more easily 'dialed in'. All those other shapes are generally not used in SFRS beams and columns, so they don't need the added requirement.
I'm sure somebody can clean up my rough memory of the history of A992.