Exactly. The procedure of taking off with the auto throttles rather than manually controlling the engines should be prohibited in the POH if the software govern

Exactly. The procedure of taking off with the auto throttles rather than manually controlling the engines should be prohibited in the POH if the software governing the flow of that procedure is unreliable. Sure, double checking it is a really great and necessary step, but you don’t throw down marbles on the floor in front of the aircrew, even if they should be able to step around them. Mistakes get made. Procedures botched, steps overlooked or conditioned by habit to be checked ok when they are not. Aviation safety is the result of defense in depth, layered mechanisms and procedures that make loss of life highly improbable. An aircraft that is faulty in a way that defeats these layers of safety is by definition not airworthy. Often, it can be made airworthy by a change of procedure, a change in operational regimes, or even by a placard on the dash. In this case, prohibiting the use of autothrottle takeofff until the software is reliable is probably indicated. Something that fails once in a while but usually works is often much more dangerous than something that just doesn’t work at all or is tagged out.