Any proficient alpine snowboarder should be able to finish any downhill course.
It can be scary, but there is no logic contraindicating it.
I competed in snowboard downhills in the 1980s, some successfully, many unsuccessfully, including kitz, wengen and iron mountain and two '80s us opens.
anyone who attended US opens in the late '80s knows that snowboard downhills are a blast. the skillsets run counterintuitive to freecarving, though: flat board, mass remains over the deck, not inside/outside.
snowboard downhills are a lot of fun.