The Heated and Cooled sections are indeed for all types of discussion, including spirtuality. I had the same thoughts as Nez to begin with and sometimes still do now, that we perhaps still need a dedicated spiritual discussion board but then that would also need to be split into heated and cooled sections to cover both types of discussions, which then begs the question "why not just use the heated and cooled sections we already have?".
There are quite a few spiritual discussions going on on the forums and ALL of the older posts from the boards are there too if you look through the discussion boards - any of them are welcome to be posted in or started new. It's not like the older content from years ago has been deleted and only newer threads are in those forum sections.
I agree the forum needs some more spiritual and even more dragon related topics going on and the only way that happens if those who want the topics, start them! If you have serious, mature spiritual subjects to discuss then start a thread, or as I said before have a look through the older ones (which you've said are the ones you miss being able to see on the boards - they are still there!) and re-start some of them, or inject life into the existing ones.
I don't think the community has changed, even with new members here, but the content has drifted away from spiritual discussion it seems for most threads. You guys are the ones in control of the content here - start the discussions you want to be part in because Sel, draco and I can't start 100s of new threads every week to cover every topic for every person. Noone is going to say "how dare you start a new and interesting thread here!!!!"

On the subject of the board layout though, what solution would you guys think works to have sections for discussion that stay active. Believe me that when the forums were split into 6 or 7 different discussion topics we'd get about 1 new thread in maybe 2 of the boards every couple of weeks. It didn't make enough sense to keep everything segregated when it all fell under the forum topic of "discussion and debate". One thing that keeps nagging at me about the combined boards though is that it can be difficult to find specific topics - like if you only want to read the dragon discussions, or only want the spirituality ones. I tried to combat this by making popular threads sticky, with the intent to sticky other popular ones on a sort of cycle. But again it comes down to people are saying "I want to talk about [this]" but not actually starting a topic about it.
Ideas and thoughts about a forum layout are always welcome. What if we had sub-forums under the heated and cooled sections for each area (like spirituality, dragons, etc)? But then you have to ask what happens to the threads that fall into more than one category? Also what do we do about the sections that only get 1 new post every couple of months, do they get merged with another thread? Do they just stay there inactive? What about discussions that don't fall into any category that we have listed there, do we also have to have a general thread?
It took a lot of thinking behind the Cooled and Heated idea because we wanted to make the forums as user friendly and uncluttered as possible. We obviously still want people posting though ...which you still can, about any topic.
Make the threads and they shall come! ...or something like that hehe.
EDIT: But seriously, all ideas and thoughts on board layout welcome. Lets discuss it and make it the best layout possible - you guys have as much input on things here as you want to have.