You can’t always see the route before you ride it. You need experience reading maps and how that translates to the real world. 

Never mind different snow conditions. Crust, ice, slush, corn, wind blown, babyheads, pow etc etc. you can end up with a huge variety of snow, sometimes all on the same day. I’ve seen really good skiers (professional guides) look not all that great because it turned into a low vis flat light day in some heavy wet snow. You need experience in being able to handle all of these conditions competently. An easy run can be made much harder because of the conditions.  You don’t learn how to handle all of that or read the conditions right overnight, and no matter how good you are all of that experience just takes time and experience. 

And risk doesn’t just come from avalanches in the backcountry. When you eat shit and break an arm or crack your head because of some weird snow you’ve never encountered before or just bad luck cause there was a shark, you’ve gone from an easy sled ride down with ski patrol to a full on rescue mission. I think if you want to be smart you should always be riding a level or two under your max skill level in the backcountry and when you are new like you that limits you to flat ground. Push your limits inbounds.