Congratulations on your anniversary. I enjoyed your original post and the whole thread. Thank you for the update which resurrected this thread.
I like your concept of Rotating Daily Carry. My concept of EDC is similar. I have OMP (On My Person) and IMB (In My Bag - either my briefcase or backpack). I keep a 10180, 10280 or AAA in my pocket. This meets most of my needs. I keep bigger lights in my bag. They can be brighter, throwier or have long runtimes depending on my needs.
On the one hand, I believe variety is the spice of life. I enjoy getting lights with features that I can use. I get a lot of satisfaction or at least get calm when I research new lights and pick something that interests me. The introduction of new emitters like the XP-G2 and 219B are not revolutionary, but they are improvements. I enjoy neutral lights, but I am not a tint snob. I really appreciate nice beams much more than tint. Which brings me to the other hand - I always seem to have the same lights in my RDC. This isn't a bad thing and it doesn't stop me from exploring and buying new lights.
Like a lot of us, I've always been interested in flashlights. Yes, they are tools and they serve a real purpose. But they are also fun. Some are electronic/mechanical/machined marvels. I have lights that are truly beautiful and I have lights that are plain and only make me smile when I turn them on. Some nights, I grab a light and the dog and go for a walk. On other nights, especially after a tough day at the office, I grab a few lights, the dog, a stiff drink and sit in my backyard and play with lights. I compare tints, beams and modes. The exercise is probably better for me. But getting rid of stress and relaxing is important, too.