I don't follow. Chewing gum is strictly better, so I'll precommit to it. Precommitting to picking only box B is better than precomitting to picking box A and B, so if I had to precommit I would choose to do so for box B.
Nonetheless, it is evidence of a bad thing.
That has been debunked.
I guess I am just following the parallels between the two problems.
Yes, you might want to precommit to it. But you don't want to precommit against it, which is Eliezer's point. In the parallel example (Newcombe's box), you do want to precommit against the thing which seems to strictly dominate, and the difference between the two cases is the justification for treating time-invariance as important.
I have not seen any place to discuss Eliezer Yudkowsky's new paper, titled Timeless Decision Theory, so I decided to create a discussion post. (Have I missed an already existing post or discussion?)