That's a "slug", it's extremely common and IMO a good thing.
Sure, you can create a weird looking or even misleading URLs that way but I don't think it's a big problem because 1/ as soon as the page load the URL gets rewritten to the real title and 2/ it's often very easy to obfuscate links regardless of that. Many platforms allow you to hide your links behind an href with some markup for instance, so you can make bogus links very easily. Think of something like:
http://google.com
This is very common in spam emails.
You can't even trust the browser's link preview tooltip because it can be overridden in JS. So in general it's a bad idea to blindly trust an URL "from the outside", slug or not.
I really, really wish youtube would do the same thing for instance, it's completely impossible to know what a youtube link is pointing towards. You could argue that they want short URLs but since they already have a "youtu.be" shortening service to make them even shorter it feels a bit redundant.