To the down-voters, please explain what is wrong with this question. IMO a perfect question to raise a discussion over.

Welcome to Ask Ubuntu! I'm sorry but this is not about Ubuntu and therefore off topic since other distributions mostly have different approaches about how to handle things we cant support that, so you might be better off asking your question on Unix & Linux. Please do not cross-post, flag your answer instead for moderator attention if you wish it to be migrated there. Thank you

I wonder what have happened to this, is there no official statement somewhere? I think this would be really useful to have them really distinct from code lines.

There are already so many answers for that, if you have an Ubuntu installation already somewhere, or a second USB stick to make a live boot from you could use my answer here.

Well if I come across a post where the image isn't visible I make it visible in most cases.

As far as I remember you have to have a certain amount of reputation for posting images :)