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Lots of evolutionary changes just don’t look manageable by random mutation. Some orchestrated jump seems necessary. How does an animal evolve color vision, given that doing so would require elaborate changes in eye chemistry, useless without simultaneous elaborate changes in the brain to interpret the incoming impulses, which changes would themselves be useless without the retinal changes?
Or consider caterpillars. A caterpillar has no obvious resemblance to a butterfly. The disparity in engineering is huge. The caterpillar has no legs, properly speaking, certainly no wings, no proboscis. How did a species that did not undergo metamorphosis evolve into one that did? Pupating looks like something you do well or not at all: If you don’t turn into something practical at the end, you don’t get another chance.
Think about this. The ancestor of a modern caterpillar necessarily was something that could reproduce already. To get to be a butterfly-producing sort of organism, it would have to evolve silk-extruding organs, since they are what you make a cocoon with. OK, maybe it did this to tie leaves together, or maybe the beast resembled a tent-caterpillar. (Again, plausibility over evidence.) Then some mutation caused it to wrap itself experimentally in silk. (What mutation? Are we serious?) It then died, wrapped, because it had no machinery to cause it to undergo the fantastically complex transformation into a butterfly. Death is almost always a discouragement to reproduction.