I think the reclinability of seats should be linked to seat pitch. With any configuration where seat pitch is less than 34", seats should be blocked from reclining, as they are in front of exit rows. As the seat pitch increases, the amount of reclinability could be increased an equivalent amount. It is a simple adjustment. Thus, the new AA configuration could have some reclinability while the old one would not. And on UA, Y+ seating could have reclinability while the rest of coach would not.