The problems with the plane have been known for a while, so much so that there is a high priority control software patch in the pipeline. The design as it exist

The problems with the plane have been known for a while, so much so that there is a high priority control software patch in the pipeline. The design as it existed is inherently unsafe as it relies too heavy on the input of a single sensor without any sanity checking, redundancy, or correlation with other sensor data. Also, the FAA makes precautionary changes before it knows everything, it has routinely issued emergency airworthiness directives before investigations have been complete.