The ancillary URL cruft version of the feature means the page effectively now has an infinite number of possible URLs and no effective "canonical" one without running into the "title changed" problem. It doesn't let you know what's on the other side before clicking, because you can change it to read whatever you want (or remove it entirely, for the people who like the intrigue or surprise). By making the URL longer it is more likely to be broken apart and formatted horribly. It causes people to go "engh, the URL is sufficient" and then not provide their own title, leaving the reader to have to read the mangled "all lower case, no punctuation, space characters missing, truncated" version of the title out of the URL; and even when the mangled form is clearly confusing it makes adding the title again more costly (longer message that night no longer fit that feels horribly redundant).
Of course, if the URL is further designed to be human rememberable or human guessable, where you can reasonably expect the user to type the URL in is, that's great! restaurant.example.com/menu/ is an amazing URL; but restaurant.example.com/8364928/restaurant-s-daily-menu/ has neither of these features: these "embed the title" schemes are just abusing URLs as storage for content that simply should not be in the URL.
It certainly isn't like this is some requirement for success: YouTube has done very well for itself without succumbing to the "embed the title" mistake. Facebook does not embed titles of posts in their URLs. Pinterest and Instagram could easily build such a feature out of the short descriptions attached to images, and Twitter could have snipped some of the tweet text, but thankfully none of them chose to. Even after being "in the game" for many years, Google (of all people) did not do this for Google+ either (though some might say Google+ isn't highly successful, and some even blame the URLs, it should be clear that tacking a title to the end of the URL would not solve any of their problems ;P).
Really, there is only one benefit I've ever seen for putting the titles in the URLs, which I think was most eloquently described by a user on reddit a few years ago in a thread on this very topic. I have provided a link to this thread, but will point out that this is a very niche use case that itself should probably not be encouraged :/.
http://www.reddit.com/r/AskReddit/comments/1gbl0u/why_does_reddit_put_titles_in_their/