You might go as far as calling it planned obsolescence.
As zanza said, avoid asetek. They're the ODM for 90% of brand name AIOs. They only use alu, and they're huge c



s. As he mentioned, some custom parts manufacturers like swiftech or ek also have some sort-of-all-in-one kits that, while more expensive, are more reliable and will perform much better over their lifetime, compared to cheap AIOs that might do well in the beginning, show good performance in reviews, and get progressively much worse.
AIOs with copper radiators do exist though, you just have to look for them. Alphacool provides units with copper rads to some manufacturers, but you'll have to double check each model. Be quiet uses them for their
silent loop series, Fractal Design for their
Kelvin series, and I'm sure more exist.
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