Oh spare me. If you went out to write a secure banking website in assembly code you'd come back in 20 years with something even more bloated than we have now. Why? Because the first thing you'd write is a higher-level programming language suited to actually building websites. Then you'd write a web framework on top of that web. Then you'd write a bunch of buggy, insecure crypto code. Et cetera et cetera until you've reinvented a much worse version of the stack we have now.