I certainly hope not. I am for example very much like you in that I enjoy grouping certain units together over others. To me - OBR was absolutely the worst looking army AOS ever designed and would hate to think I must use those units to field Arkhan or whoever.
Giving people free choice to do what they’d like with their models has always been a plus in AOS - given mercenaries , allies and grand alliances. One final update down the path for Legions of Nagash ( just tome) would be more than enough to satisfy people like us who enjoy a true combined death force like the past.