Ignoring genetic drift and taking into account only natural selection, all that's needed is differences in fitness, i.e. differences in how much an individual contributes to the gene pool of future generations.
There are ways we could avoid losing most of that survivability but of course they are wildly unpopular such as actively discourage people with terrible inheritable diseases to procreate (e.g. ALS, Lupus), favor reproduction of people with both higher intelligence and physical skills (e.g. goverment subsidies for their parents, tied to their children grades and general well being)
Not sure if he's the originator, but I'm pretty sure I learned about it in a Richard Dawkins book.
Like the traits must have already been present in some lower frequency pre crisis, and the crisis distills the traits which are selected for by the crisis.
So probably less evolution moves faster during crisis and more that there is an interesting survivorship bias related to crisis when analyzing the change of a species over time.
Evolution is not primarily driven by the mutation rate. It's primarily driven by differential success of already-existing genetic variation. Over the very, very long term, you need mutation to be the source of that genetic variation, but over the short term mutation is mostly just harmful, and this:
> Like the traits must have already been present in some lower frequency pre crisis, and the crisis distills the traits which are selected for by the crisis.
is correct.
> So probably less evolution moves faster during crisis and more that there is an interesting survivorship bias related to crisis when analyzing the change of a species over time.
This is conceptually wrong; in this context "survivorship bias" bears a technical name you've probably heard of, "natural selection". A stronger survivorship bias means faster evolution.
I only mean, natural selection is the survivability of e.g. a nose shape trait across generations, which can happen via reproduction, early death, etc and it’s not about survivability of the person WITH the nose except to the extent that facilitates the former
Survival of the fittest traits