We are already here. Removing this functionality would degrade the presentation of snaps on snapcraft.io.
It has not been argued that a web page’s worth of content should be presented in a description. Indeed, being able to link off to other pages keeps the description focused on the app’s merits.
Code blocks are useful to demonstrate the utility of your application through examples. Countless manpages and the success of tldr evidence this. Developers like Andrzej wouldn’t be using this if they didn’t think it would help people understand and be motivated to install their app.
It is also worth noting that code blocks are helpful in outlining post-install instructions. You can find many cases in the store walking the end user through connecting needed interfaces or placing assets in the right directory.