That's true but with dust filters, its highly dependent on the quality of case you buy. Some come with them, some don't plus they have to be cleaned otherwise airflow becomes more restricted. The main problem with liquid cooling for me is that people who don't know how to build a PC or lack the experience would likely not dig into the hassle of setting up a pump and that shit while they can hardly cable manage for shit. I think it feels more imitating than it should since as kids, we are taught to not mix water with electronics. It also depends if the fans on the case create a positive, negative, or neutral airflow system.