Old Boeing Driver
"... the Lauda 004 incident comes to mind. There is still controversy about whether a high speed deployment would be survivable"
Apparently not, according to Boeing and the final report, at least not at cruise altitude. Certification tests showed it should be controllable but they were made at lower altitude. When Boeing flew the Lauda scenario in the simulator the loss of control was so rapid that there was no possibility of catching it in time.