Writers online publish a lot of advice, and it's an incredible thing. When I was twelve and wanting to write, I didn't have anyone I knew who loved writing. All I had was the Internet and sites, blogs, and forums where writers, agents, and editors gave their tips and insights on a process I knew little about other than my passion and imagination. I learned a lot while feeling less alone in my pursuits.
So, don't think I'll ever deride writers for sharing their experiences and giving advice. And many of us live in a time when one must be assertive in their declarations: do this and definitely don't do that.
However, as I've mentioned before, I have trouble being as definitive. Writers stake their identities on a lot of things: their genre, whether they plot or pants it, etc. "Are you a plotter, pantser, or plantser?"
"Oh, I don't outline that way because I'm not that kind of writer." – a writing friend
"[Plotting a novel is] the good writer’s last resort and the dullard’s first choice. The story which results from it is apt to feel artificial and labored.” – Stephen King
This discussion isn't so much about outlining versus spontaneity. I am a fan of doing whatever works for you.
Also, when I have a project, I don't approach each one the same way when it comes to planning. The thing is, while the core considerations I take when writing are the same—what the character wants and how it drives them—I don't follow the same outlining method every time, nor do I always stick to an outline I've created if it feels as if the plan would be unnatural and forced. A story can require different considerations depending on the viewpoints, focus, and length.