Okay, but he didn't comment on the possibility of putting it in a hidden preference screen available by URL only. He hasn't explicitly commented on the middle ground between preference screens available from the menu and add-ons, so it's not fair to say that he's claiming it should be done away with completely.
His point was, and I agree with it, that a mass browser does not need to expose cert management in a way that the 99.9% can access it because it's likely to cause more harm than good for anyone who is not capable of jumping through a few extra hoops to get to it.
I'm sorry, but the answer isn't to remove options that often make sense. You don't want to be like the Gnome guys, who in the guise of making things "user friendly" removed often extremely useful functionality.
Like removing the certificates manager. Or cache control. Or the ability to restrict cookies. Or JavaScript. Or the ability to turn off menubars, should you so desire to do so (kiosk mode). All of these things are used by people. Just because he doesn't like it, doesn't mean others don't want it.
His point was, and I agree with it, that a mass browser does not need to expose cert management in a way that the 99.9% can access it because it's likely to cause more harm than good for anyone who is not capable of jumping through a few extra hoops to get to it.