I asked the designers of the Mi-28 why the KA-50 was designed the way it was - they said it was not designed for NOE or anti-tank warfare as we knew it. It was designed to do a single high speed pass through the front lines on pre-determined tracks with pre-assigned targets, literally spitting death as it came, and then once past the front lines, turn around and head back home.
It had a very limited traverse on the single gun, a cockpit you could barely see out of, and a single pilot.