No. Some find this hard o believe. But absolute not because of what I do, besides writing, which is run Life-Change and Self-Change course, I understand the underlying mechanisms which contribute, cause and create writer's block. Once those are understood it's not difficult to break at all. Ha, I have a book I need to publish called, Writing Tips to Myself, where I go into this in detail as I also do in my Programs and Courses. It's about the underlying psychology, habits and motivations, all of which I deal with. Main point is, don't buy into the believe that writer's block is a given with writing. It's not. I'm not the only one who doesn't experience it. I am though one of few who can explain it. :) :D
Passion. Passion to express what's deeply important and meaningful to YOU! The rest follows. I've read brilliant and awesome writing that was terrible grammatically etc, but that made no difference at all to the potency of it. It helps readability ofc, but once we confuse grammar and punctuation with what is Good, we're lost. Good depends on both the Intent of the writer and the reader.