Not everyone is a fan of the RSV-2CE.
The Second Catholic Edition is an Ignatius Press proprietary modification to the RSV-CE. They never told anyone the names of those on the team making the changes or what their philosophy for changing anything was. The choice of what they changed seems arbitrary.
They also did not incorporate the most recent archeological findings and advances from the Dead Sea Scrolls. Say what you want about the NABRE but at least they used the latest scholarship whereas the RSV-2CE does not.
I’m sure the Didache Bible has some good content apart from the sacred text but the sacred text itself leaves much to be desired. The arbitrary changes and Ignatius’ bundling of all the extras including commentary from popular apologists make it seem like more of a marketing effort than anything else. I say this as someone who has read the RSV-CE cover to cover five times and owns the Ignatius RSV-2CE study New Testament.
The RSV-2CE is not the gold-standard in Catholic Bibles that everyone thinks it is. That is my personal opinion.