Sarah J. Maas is outstanding!
I wonder if readers are receptive to male authors of romantasy. That's always been a problem with romance. (Well, a problem for male authors, anyway.)
I just finished the Throne of Glass series. It's interesting to note that Maas does have a HEA structure--but the characters really, really have to work for that happy ending. War, torture, curses, crazed dictators, evil forces from other planes of existence all block the way. And while the main characters get that ending, some of the secondary characters don't. (I recall that from one of her other series, Court of Thorns and Roses, soon to be a TV series.)
Also, at least in TOG, the viewpoint shift and isn't always female. In fact, quite large chunks are done from a male viewpoint.
In other words, it seems a little more like fantasance to me than romantasy--the fantasy elements seem predominate. The love interest is central, but it shares the stage with an enormous number of other threads.