I'm now looking at these forum posts 5 years after they were made. So I'm not sure if anyone is still considering the ideas of TTRPG design theory, but then again, a lot of the thoughts I've read seem have been generally talking in circles since the days of "The Forge", and even these discussions echo back to theories that were cycling through the community back in the 90s according to people I've spoken to over the years.
I'd love to see more rational discussion happening in this area, more critique of how games work and how their working interact with the experience of play. Especially highlighting the way different games approach the same elements in different ways rather than just saying D&D does this....and that's the benchmark system for our hobby so that's all we'll talk about. Over the past 12 months, I've been trying to design a range of games, often using a range of other people's SRDs because I love trying to get a practical glimpse into their design methodology. I want to talk about the why, and the how, but I don't know if anyone else wants to talk about things like this anymore.