Re: R9000 AD
If you don't have any AD supporting devices then the router would probably not be a wise choice. If your looking to get some AD supporting devices, I presume there are not alot currently, then at some point maybe AD router would be ok.
I would stick with and AC class wifi router.
Additional NG HW: C7800/CM1100/CM1200CM2000, Orbi CBK40, CBR750, RBK853 v18.104.22.168(AP) & RBK752 v22.214.171.124, RBK50(v22), SXR30(v110), R7000(v34), R7800(v84), R7960P(v82), EX7500/EX7700, and WNHDE111