yes asrock, evga and asus all put out decent ITX boards in the current generation. however that's not to say they are in the Asus RoG category when it comes to hardcore OCing. what it comes down to is high performance VRM require high performance cooling on the VRM itself. and there's simply isn't too much room on an ITX board to set down big blocks of heatsinks just for the VRM's and still allow for enough room to put a good sized cpu cooler.
people need to remember ITX was not meant to have tower coolers since the only reason to go ITX is for a SFF build. since 90% of SFF builds still rely on low profile coolers, (to keep the case small) they cant designing the board to "require" tower coolers. if you go to the SFF section of the OCN, you will see ALOT of people would LOVE to have a RoG class ITX board and dump it into a prodigy or node, but relatively speaking people on OCN are the minority when looking at the overall mobo market.
maybe further down the line, as the current generation of ITX boards increase sales, they (cough Asus cough) MAY decide there IS sufficient demand for a RoG class ITX board and grant us the much sought after high OC performance ITX board to put into those prodigy/node 304/SG08's people are buying up. we have to remember that not too long ago, we can barely even OC Sandybridge on ITX boards. now you can comfortably OC Ivybridge, but just not to the same degree as the TOP OF THE LINE OC'ing boards like the RoG's