I use & love Firefox, too, but do note that the author's criticism directly applies to it, too: AFAIK, FF will not show you the individualized cookies, or all you to act on them individually.

Now, as you say, you can download an extension (and indeed, I do!), but I think there is some merit to it being in the base app. (E.g., not having to trust an extension. But also, it's part of Firefox's data, and FF should provide decent tooling for itself.)