And yet, there are many mechanisms which can bring about astounding complexity. An intelligence doing intentional design is only one of them.
It was always so strange that the professors teaching it seemed blind to the silliness of the only argument they had at the time (by A.I. Oparin) that it was just a property of matter to organize itself into life, no need for God here, nothing to see, keep moving...
As usual, if something seems silly, one must first ponder whether one has understood it properly.
Your summary (and probably grasp) of Oparin's thesis does it a gross injustice. Nor is it the "only argument" in abiogenesis. Finally, the field has progressed immeasurably since Oparin's 1924 pamphlet...