NV2 is an option. " Can be set …" Depending on the environment that option can improve the link quality and stability, and will not wait for 802.11 signals.
One of the reasons to use CUBE (60 GHz) is because one has to work in a crowded 5 GHz environment.
In such an environment NV2 has some advantages: http://forum.mikrotik.com/t/ptp-802-11ac-nv-80mhz-real-life-speed/151354/1 , http://forum.mikrotik.com/t/best-point-to-point-protocol/145926/2
The 11.5 dBi 5 GHz antenna of the CUBE is not documented for its RF directional spectrum.
Comparing with other similar antenna even with higher dBi the receive angle with signal amplification can be quite wide. But I have no numbers.
If 802.11 suffers from CCA waits , or if the CCQ is below 90% , NV2 can improve.