(I've basically never participated in YT comment discussions. There's definitely a lot of idiocy, but it's also interesting to just observe and see the sometimes surprising positive things like this that can occur.)
URLS are pretty rigid. If tommorow http was swapped out for a different protocol what would happen?
You'd be better off referring to the article posted as Allenpike's article on removing urls (or some such).
Fuzzyness feels more natural. I can bookmark a rigid URL, but what if later it moves? I might be better off bookmarking a signature of the article (a very basic form might be Author and Title).
The search engine's have a signature of articles, and if you are lucky that signature will be matched somehow against your loose search query. The success of search engines depends upon how well they order and match against your input.
For me this is another evidence that the main argument is broken. Youtube is super successful but in fact it is really restrictive when it comes to hyperlinking and mashing things together.
Update: just for clarification because of the downvotes, Youtube does not filter Youtube urls.