This thread is a long conversation over several years it seems so it's quite likely you are going to say something already said before, possibly several times over...
but I'll take this risk and just say that one of the differences that comes to mind immediately between these two concepts, "Survival" and "Bushcraft" is that one is about necessity and the other about satisfaction and pleasure...even deep joy and fullfilment...
Although some or many of us do enjoy the challenge and minimalism of survival situations, and also see mere survival as an art in its own right, may deliberatleychoose to live on the brink, for awhile or for longer, the idea behind the word is of bare necessity. Not necessarily hardship, but no idea of pleasure, apart from the satisfaction (which can be deep, often is!) of having survived when it's all over.
Buth then I am a woman, and perhaps men take more pleasure than I do in mere challenge and overcoming obstacles...and I may underestimate the fullfilment they get from it. So its' all relative...
Bushcraft is more straighforwardly something that is enjoyed or has enjoyment and pleasure as one of its main goals, its core.
Enjoyment contains the word "joy"...Could be because it is in our genes..goes back to the 99% of our time on earth spent before agriculture, following herds around...we are the living proof these guys had a good time!
To come back to these two ideas, bushcraft is more strictly about living in the wild as the word indicates.
And survival a concept not strictly limited to living in the wild. Living in large cities, living in the early, predominantly modern 21st century, the word "survival" springs to our minds more often than we would wish it did...!
Is it the same "survival" as we mean when talking about the Bushmen in the Kalahari desert? Well yes if you consider the threat on their future by people who want to allocate their land to mining...
I wouldn't say that their way of life "on the brink" as such is more "survival" than "bushcraft". On the contrary I would say it's more on the bushcraft side because it gives them joy and fullfilment. It wouldn't be so ancient if it didn't...
No wonder this is a long thread...the reflexion gets endless...interesting though!