While generally true that really depends on how hot things are going to get relative to the thing you wish to cool. Too hot is too hot. Also though a bit off topic is that the hotter it gets the more and more airflow that is required. At a certain point not only are mechanical fans loud, but so is the moving air, not to mention the literal vacuum cleaner/leaf blower you just created.
I this case (sorry no pun intended) making a 1500$ ridiculous video card that takes your two biggest hottest chips that use the most energy (tho this version apparently tweaked to take less somehow), puts them on the same board, would require something a bit more than your standard heat pipe. Hence why it is probably liquid cooled in the first place.
I recently experimented with one of the newer AIO liquid cooled solutions (H90 I believe it was). Not sure how much better it would be from a high end conventional heat sink heat pipe fan combo, however it does have some advantages. One of which that isn't always apparent is displaced space. Putting a huge 1kg chunk of copper, pipes, and 140mm fan takes of a lot of real estate literally in the middle of all the business. At least with the liquid cooling solution you can relocate that someplace else, though you still have to route the tubes. In an ITX case for example it can be a big deal, particularly if you actually want to access anything on the MB without removing your cooling solution every time.