Beyonce doesn't need to haul herself any further up the fame ladder by covering Jolene.
If you want to argue that that's a way of making the album more palatable to the (musically conservative) Nashville establishment and to present herself as being the latest in a long line of black country artists like Charley Pride I'll agree with you, but I don't think that'd necessarily a 'careerist' move.
In fact, it's an odd criticism to make of someone who manages to successfully combine global superstar status with genuine artistic chops.
I think Holding Absence could do either slot, I don't think it was last time they played the Neu Stage that James said, just that they have played it. Though not sure if they're active as Lucas will be fronting FFAF the weekend after, but he attends Trees if they're playing or not anyway.