I don’t know how selection pressures would take hold exactly, but it seems to me that in order to prevent selection pressures, there would have to be complete and indefinite control over the environment. This is not possible because the universe is largely computationally irreducible and chaotic. Eventually, something surprising will occur which an existing system will not survive. Diverse ecosystems are robust to this to some extent, but that requires competition, which in turn creates selection pressures.
I don’t know how selection pressures would take hold exactly, but it seems to me that in order to prevent selection pressures, there would have to be complete and indefinite control over the environment. This is not possible because the universe is largely computationally irreducible and chaotic. Eventually, something surprising will occur which an existing system will not survive. Diverse ecosystems are robust to this to some extent, but that requires competition, which in turn creates selection pressures.