~rolls on the floor laughing and groaning~
Here's the thing about writing advice (okay, okay there are many "things" but this ONE thing is...), it spans the humungous pool of all types of writing. From journalism, to academia, to tech writing, to memoir, to screenplays, to speculative fiction, to romance, and all the niches and crevices therein.
Methinks the boredom adage, along with its cousin "Write What You Know," is bleed over from the non-fic world. There's a lot of advice from that sector that simply doesn't apply to fiction. Think about it. Unless we're being paid heaps to ghostwrite something tedious, why, oh why would we waste our time writing something boring? Why, when most of us have hundreds of story ideas clamoring for the sustained attention required to write a novel, would we punish ourselves with the dull and uninteresting?
That's not to say that every word, scene, chapter, and revision is on-the-edge-of-our-seats exciting. It is work. Sometimes we have to force ourselves to get through a scene, but it's not because of boredom. We've got a long list of better excuses for those moments.