Why aren't there heat pipes in water coolers?

[Ryanwake]

spoiler regular heat sinks won by a landslide because of the heat pipes, and I get that the tubes for the water coolers are basically replacing the heat pipes. 

 

But water cooler still have a copper heat plate, and that's the downside, I don't see any reason why you can't replace the heat plate with 6 + heat pipes in a larger chamber above the CPU.

 

This would also increase the amount of water with barely less access to the heat coming out of the CPU.

 

For example 2000 watt LEDs the size of a threadripper CPU doesn't actually need fancy channels or heat pipes to stay cooled, just a larger surface area means that a flat copper plate and the large amount of water sitting on top of it is enough to keep it cool.

[Streetguru]

1 hour ago, Ryanwake said:

 

I assume it's simply not worth it for any benefit it has.

The only place it'd be really useful is right at the heat source, with like a vapor chamber that goes into the pump. But heat probably moves fast enough already that it doesn't need it.