I don't want to edit code as such. However, when I switch to the Source view, I would expect the editor to let me enter literal strings (like '[[something_and_something_else.md]]') without changing the text in any way. As you can see in the video, backslashes are added automatically before special signs whenever I type anything.
So, to sum it up - it's not about entering code blocks. I just want to write in plain text with no meddling on Onyx's side :) My preferred way of working markdown is to write in plain text and then use the Live view as preview.