I dunno about that. I've just got done reading some screenplay advice, and the very first thing written was "a lot of ideas simply are never gonna work, so spend some time getting a really killer idea first". Now, yeah, Hollywood is different, because they can have less movies than we have books, and they're really shooting for the stars every time, but there's something to be said for the idea. If your idea brings nothing 'new' to the genre, its probably not going to get very far, no matter how well you execute it.
Sure, the line between concept and execution can get fuzzy at times, but at some point you have to decide what you write about, and even the greatest prose and timing will struggle to save you if you chose to write a really dumb idea.
I would add that you don't need to be radically new or subverting tropes or any of that. Harry Potter is a pretty much straight up Chosen One. The whole "Chosen by his enemy" thing is a kinda cool twist late in the day, but we're talking cake decoration rather than cake recipe. Harry Dresden is basically all the wizard and noir detective tropes in one, which is both really old and really new. And done a few other times before by others. I would struggle to tell you what Brandon Sanderson brought to the table that was new in Mistborn other than the magic system, And so on. I think a lot of people worry about subverting cliches when they don't have to. You can tell a fantastic story using a lot of the cliches fairly straight. That's why they're cliches. Obviously if you want to go to town and subvert like mad and change the rules, that's different, but you don't have to do that to be the top dog.
In fact, I'd argue that embracing the core archetypes of fantasy is a necessary move to be top dog. Not "Has a wise old teacher who turns out to be his grandfather or mother" to pick one from the list linked in the first post, but stuff like the Chosen One. The Mysterious Mentor. The figures that are in the tales this race has told hundreds and hundreds of times; that has happened for a reason. Don't get put off by people bitching about them, just google Rowling's sales numbers.