If you are carrying skis, snowshoes etc obviously the conditions are extreme enough that a higher weight is inevitable (and as I have already said a lightweight pack is not an option).
However this to me indicates that your walk is more an expedition than a bushwalk.
I view the difference as being an expedition is where the walk/hike is secondary and there is an element of being more or less stationary when you reach some point or points. A bushwalk is a hike where you keep moving and in the cases we are discussing here you do so for days at a time.
An expedition is something where a heavy pack is fine as the hike is the means to an end and the true enjoyment is when you get to where you're going. Getting there is an accomplishment but probably not a pleasure.
For me I tend to pick expeditions where I can get close with the car....

A multiday bushwalk is where the enjoyment includes (but is not limited to hopefully) the actual hiking. I just feel that those who are carrying very heavy packs for multiday bushwalks are relishing the pleasure of the accomplishment and the stops but lose on the pleasure that can be had from the walk itself. Again I stress I never want to make anyone feel that they are doing the wrong thing especially while on the walk, but I just found myself that for me a sub 16-17kg pack is not a strain and at about 19-20kg I find the pain seriously impinges on the experience. Call me a wuss but that's my cutoff point.