Out of all the PC components I’ve purchased for my last few builds, perhaps the most useless was the AIO liquid cooler I got for my current PC. I bought it purely for esthetics. My 65W Ryzen 7 5700X didn’t really need liquid cooling, and the cooler didn’t do a great job of cooling it anyway. If I can safely rule out a single component from each of my future builds, it would have to be an AIO. I know what kind of CPUs I’ll pick in the future, and air coolers will easily tackle any of them.