Nice to revisit this.
Withdrawing an accepted paper
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It depends on whether you are on the job market:
an R&R looks wonderful to search committees, it allows them to imagine a bright future for you
but an accepted paper just makes you look desperate and potential new colleagues will be jealous ("yeah, he/she has a publication but so what...?")
that's why, as a jmc, you should immediately withdraw any accepted paper
hope this helps