All said, I’d happily run roll on the unity when it comes out and I think they would be quick to make you whole again if you had a hardware malfunction on one side.
Size was the reason I went for dual on single pen board recently.
In my N of 12, I’ve burned one drv on an early 4.7 (8?) vesc, jacked up firmware on a vesc6 (my bad), and burned components off one side of a 6.x dual. So far, I’ve had zero issues with my two single focbox’s and they have seen more miles and higher amps on 10s and 12s with zero logged faults than all the rest.
Not a full throated endorsement of focbox, but it works for me. If delivery times for the unity are stupid, I’d happily buy two more singles.