I'm curious whether I could have gotten the physics to work out if all rotation was independent, and what else would be different about that world.
Well, for one thing it would be mathematically incoherent.
Actually, rigid rotation is more complicated than you seem to think. While instantaneous rotational velocity (at least in 3 dimensions) is always representable by an axis and an angular velocity, the angular velocity can change even in the absence of torques.
Edit: Also how are you representing orientation as (ox, oy, oz)?
it would be mathematically incoherent.
I'm not sure what you mean. You're saying it's not possible to make a coherent mathematical description of a physics system where something rotates around multiple axes? It wouldn't correspond to our world very well, but why are the mathematics impossible?
the angular velocity can change even in the absence of torques.
Yikes! Yes, even the model I ended up with sounds like it didn't represent rotations properly.
Also how are you representing orientation as (ox, oy, oz)?
This was about a decade ago, so I'm not...
What is something you used to believe, preferably something concrete with direct or implied predictions, that you now know was dead wrong. Was your belief rational given what you knew and could know back then, or was it irrational, and why?
Edit: I feel like some of these are getting a bit glib and political. Please try to explain what false assumptions or biases were underlying your beliefs - be introspective - this is LW after all.