To answer your question shortly, POWDER has never only featured just Powder skiing. In fact, there were a quite a few early spring issues in the late 70s and early 80s that covered kayaking, tennis, sailing, and snowboarding (this section would later become SNOWBOARDER magazine). The title on the magazine will always be the same but for me the subhead says it all, "The Skier's Magazine." If there are skis on their feet and it's a good story, it'll go into the magazine.
I do encourage you to write a letter to DT. Send it to PowderMag@sorc.com. Subject: Letter to the Editor