Except maybe for the cache control, the settings the author talks about are basically useless. Third-party plugins like NoScript are a much better solution. Be honest, do you use the "Disable JS" checkbox, or do you use NoScript?
"Disable Images" can be handy in certain, very specific settings, but it doesn't really deserve a slot in the main preferences dialog.
I don't think the author is advocating the complete removal of these options. I think he's objecting to how prominent they are in Firefox's UI. about:config is the perfect repository for all of these tweaks, and I expect the dialog is already just a frontend to about:config.
His point is they can make better use of that prominence than they currently are.