Actually, I already saw that, and when I was originally creating my monster SECTION_DIMENSIONS_SUBSECTION_ARTICLES table, I was attracted to that!!
Although you would normally JOIN back to the SECTIONS and DIMENSIONS tables if you were using IDs as your primary and foreign keys, one of the HUGE advantages of using NATURAL KEYS (remember, that's where we started? <grin/>) is that you don't *HAVE* to do that.
So extend the logic: When joining to section_dimension from other tables, there is *STILL* no reason to join to sections if all you need is the section name.
Once again, this is all a nice fall-out from choosing to use natural keys.
Play with it some more if you aren't convinced.