I think the ethos is different between bushcraft and survival even though most of the skills are the same.
Survival, to me the main priority is to get out of the situation and back to a comfortable enviroment.
Bushcraft is about extending your stay and making the situation you are in more comfortable.
If you go out in the woods for a day, maybe two, you can carry all you need, food, water, shelter fuel etc on your back, you can call it camping if you want.
More than a couple of days you won't be able to carry enough water, you will have to replen, you can use a tap, or find water and filter it. Your pack is lighter when you start, knowledge and/or a water filter weighs less than the water you would carry for a couple of days.
More than about a week you will have to forage/catch food, again knowledge and/or snares weigh less than your food would. A weeks fuel would also be impractical so you have to make a fire, again knowledge/skill weighs nothing.
A bushman (or most aboriginal peoples) carry very basic kit but lots of knowledge/skill, bushcrafting IMHO is trying to get back to these basics.
The bushman survives pretty well with next to nothing, as we generally see it, and I think I am pretty good at surviving, managed 38 years not out up to now! I couldn't survive for long as a bushman as he could probably not survive, without some training and practice, in my situation.