The B-52, like some airliners, didn't have ailerons because of control reversal.

With the long, thin wing, a deflected aileron could actually make the wing twist. The down deflected aileron would lift only the trailing edge of the wing, causing an effective negative AoA.

The result would be a left bank when a right bank was commaned, or vice versa.

I used to fly KC-135s ... we had ailerons, but the outboard ailerons only worked at low speeds (flap lockout) for the very same reason.

-Allan