Dual WIFI 5 GHz TOTOLINK A8000RU

I have two new TOTOLINKs which have two 5 Ghz WIFI ac but which operate in low and high band separately and I wonder what this can be used for

A WIFI client cannot use them at the same time so ....

client separation, network or throughput wise ....

For a 5 GHz backhaul on one radio, and client facing acces point on the other. That's the point of 5 GHz radios each being hardcoded to the upper/lower part of the 5 GHz spectrum.