If you take the same strategy and apply it to a modern PC using modern hardware the results are not so dramatic. For instance a Core i5 6600k is a overclockable 91w CPU that is already extremely fast and easily maxed out with a quality aircooler. Because of this you no longer need to watercool to get the same performance and can shift your focus from being the fastest to simply looking awesome.

Watercooling also has some practical drawbacks in terms of overall cost, increased maintenance and failure points. A simple coolant leak can damage PCBs or at best cause the system to run dry if not monitored. Dust bunnies can block airflow to the radiator lowering your cooling performance while a total pump failure can quickly overheat your system causing a meltdown that could tear a hole in the fabric of space and time.

Or, more realistically just cause the PC to crash and shut down.