I agree with this sentiment. I'm not sure I've ever seen a url referred to as "good", I was just a bit confused as to why someone would baulk at a URL. In my opinion everything after the host portion of the url is to serve the apps needs, so it knows where to go or what to do, it's not really an interface for the user as obviously there are better ways to present that.
* Should be book-markable.
* If searching with a query, should have a clear query parameter for ease of browser integration.
* If the URL contains slash dividers that can be read as categories (e.g. storefront.com/department/category/product), then deleting everything after a given slash should go to that category’s page.
* The link should be short enough to be sent over a plain-text conversation without becoming a wall of text.
* The link should be short enough that it cannot hide a malicious subdomain (e.g. Google.com.flights.malicio.us/more/elements).
Opaque slugs are problematic in a low-trust world. Phishing attempts are easier when the parameters are indecipherable. I'm not clicking on that shit in a text message or an email. I've seen what happens to people when they do.
If the URL has a bunch of goop in it, people are going to make fun of me for it, especially if it's super long and doesn't fit in a single line. Or if there's stuff in there that's specific to me and not the thing I want to show them.