Those non-A Type bearings are absolutely not useless. In today's cost cutting market, if you're a manufacturer like Boeing or Airbus building new airplanes and you can spend $50,000 for bearings that meet the spec but only last 25,000 cycles, or $100,000 for the same spec bearings that last four times longer, and the dollar is the bottom line, which would you choose?
You'd go with the cheaper ones for a less expensive airplane and count on the purchaser to upgrade to the longer life bearings when the life cycle is reached. That's the real world.
