Even though I do think decoherence-based MWI is a better model than Copenhagen non-interpretation, it doesn't look like there are any new arguments in support or against it on LW anyway.

Having read the Quantum Physics Sequence, I think Eliezer himself would agree with that. I think the actual point was to show the crushing power of already existing arguments, to showcase a foolish long-standing rejection of compelling arguments by very bright people.