That's odd. Seems like some common terms would help alleviate confusion. Or perhaps the idea is "we'll just call all the parts one thing and then say to not mess with that one thing."
I started out down a path towards structural before realizing I didn't have an aptitude for it. Beyond the basics I get completely out of my depth. Most of my work these days is in environmental restoration (as well as conservation and mitigation), stormwater management, floodplain development regulations, etc. Lots of eco-friendly greenie stuff.