Part of it, I'm sure, is that the A350 bug is comprehensively root-caused and that root cause is understood to be completely bounded by rebooting the system, wh

Part of it, I'm sure, is that the A350 bug is comprehensively root-caused and that root cause is understood to be completely bounded by rebooting the system, whereas MCAS reduces the number of points of failure to, in certain builds of the 737 MAX, a single sensor.