nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqqv5atqz9k9c54q8c28kra6sfata0wk7w7x5gkrnde8vmxe5gt00q3n8x2j (nprofile…8x2j) I think another point for fins is that they have more thermally conductive material overall. I think that when you have air flowing across a pin heatsink, the volume in the "shade" of these pins contributes little, and might as well be filled with thermally conductive material to transport heat to the top.
Another consideration is mechanical stability. Pins have to be pretty chonky to not bend, and to be machineable or moldable, whereas you can make fins much thinner.