Also, there is the problem that evolution is often incorrectly presented as progress, generally towards humans. But simplifications and reductions are quite common in evolution. Because evolution is actually survival of the fit enough rather than the fittest, and because the real world has many constraints and interconnections, it is common for “improvements” to have downsides as well. As long as it works, organisms can survive. Over the long term, some organisms specialize in particular ways, and so there is directionality. The earth has inherently limited resources, though there is significant variation in the level of competition. But even if there is plenty, individuals with really bad conditions are likely to do poorly. This also tends to give a degree of directionality.