From my side I think it would be a great addition.
Getting the animations to be more widely available in different Bethesda games would be a pretty nice addition to the roster of animations where they are lacking. Though I haven't really been following the FO4 modding scene, back when I played it some time ago there definitely was a lack of animations.
Though it would come with the problem of different body types, lacking physics (or at least differing physics), missing assets etc, but still it would be a good start nonetheless. But if users understand that at least and take the minor issues as is then I can only see benefits.