@iaincollins
Thank you for this interesting take on scaling difficulty - I especially agree with your points on level scaling and asymmetrical balance.
Level scaling was a terrible attempt at a compromise to incorporate into a roleplaying game like TES series. I still remember the fear and thrill I felt in Dark Age of Camelot when I went over and over near a zone of "purp (difficulty) mobs" but could not take them, and the subsequent feeling of accomplishment when my character was finally strong enough to beat them. That feeling should not be taken away under any pretext of balance or compromise.
Asymmetrical balance seems like a holy grail to implement in today's crowd, we no longer have the playerbase that appreciated the approach the original starcraft / warcraft 2 took.
On the issue of difficulty, failure and pain in games, I highly recommend "The Art of Failure" by Jesper Juul, even though it might be a bit too philosophical for some people's tastes.
I hope to see more articles like this, Iain!