We're not losing any interesting questions
The projection step is still a mystery. Even if we can trace the density matrix down to the diagonal state (not sure if it has been done experimentally or numerically), it's not clear when the real or perceived eigenstate selection/world splitting happens. Seems like an "interesting question" to me.
Umm, in what sense does the theory decoherence not address this, aside from the issue of subjective experience? There's a gradual decoupling of the components as they lose mutual information.
Today's post, Faster Than Science was originally published on 20 May 2008. A summary (taken from the LW wiki):
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