I think the biggest benefit of TAs with disc brakes is mitigating all the fucking rubbing and mis-alignment with QRs. You (hopefully) won't be taking the wheels off and and all the time, but you will be putting a lot of flex and punishment on the wheels, so the strength of the TAs will hopefully keep them quiet when you're bouncing around off road.
I think the biggest benefit of TAs with disc brakes is mitigating all the fucking rubbing and mis-alignment with QRs. You (hopefully) won't be taking the wheels off and and all the time, but you will be putting a lot of flex and punishment on the wheels, so the strength of the TAs will hopefully keep them quiet when you're bouncing around off road.