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Well I'm certainly not qualified enough to offer any feedback on those points. Maybe someone else can chime in on the thought process behind some of those. What I do know, is that sometimes people who manage engineering teams tend to think they know better than the engineers, and they force their requirements into a design even when it isn't necessary to be "extra" sure that things like vibrations are not noticeable. There always seems to be forces fighting each other in automobile design.
As someone who runs complex engineering programs, the number one objective for us is a technical one. We have to meet the performance characteristics or it simply won't be a competitive product. Second is nearly always schedule, then cost rounding out the top three. If for some strange reason we have time and resources to design out some cost, then we do it.