I don't think you can classify all dyings into one category for the purposes of evolution dying due to making a mistake is useful so a new version is released afterwards but just dying for no cause or due to poor design is actually something evolution should want to prevent with more time to live you have an increases odds of producing as many offsprings as possible.
It’s not just the number of offsprings a single individual produces, rather all offspring defending from that individual that should matter. You can waste energy trying to change according to the environment and live long enough to produce more offsprings, or you could use that energy to produce more slightly evolved offsprings Who in turn can produce more offsprings.
In that case you end up with population control problem.
Besides, if you look at all big society changes, you'll notice the old generation of people that lived before the change have a much harder time to accept / adapt to the new order while it's natural to the new generation.
