"It doesn't prove anything, but it does mean something." No it doesn't. The history of science and technology is filled with things that people couldn't achie

"It doesn't prove anything, but it does mean something." No it doesn't. The history of science and technology is filled with things that people couldn't achieve, that were considered impossible, and then were done. There is no way you can simply look at the fact that it hasn't been done and is considered hard and conclude anything about whether it can be done or not. To hopefully avoid a potential misunderstanding: you can give specific reasons why X seems hard to do and not likely to be achieved, and these can mean something. But it's these reasons that mean something, not the fact that it hasn't been achieved so far.