Yes, but putting aside the fictional manual, how many redshirts are actually seen on screen in the original series, and how many of those end up dead? Or to refine it a bit more, how many redshirts are seen being beamed down to a planet, and how many of those die? That should give you the actual risk factor of being a…

I strongly suspect that the "inability to build cohesion" that you mention is your own inability, not that of the writers. They are simply keeping their secrets for the time being.