Check out my PC. It’s a silly one, I agree, I build it for fun and because I sit behind it 12 hours a day and love to see how things work. But check out the fans. There are two for the GPU, three for the CPU (total overkill but I overclock like a lunatic), one in the PSU and two small ones that cool bits of the mother board. These are needed because contrary to what many people think a completely open case is very bad for cooling as you have no air flow.  So that’s 8 fans that are cooling my mac