If you're a writer who has published, then you get asked to speak or be on panels and talk about the various aspects of writing. Many writers are teachers or teach now and then. In the modern writing world, writers often articulate their process, their thoughts about character and so on to audiences or classes. This can be very helpful to inexperienced writers--but not always.
I am not talking about responses to specific work by a new writer (the direct responses that speak to a person's work) but the more general advice writers give to other writers. When a writer gives a talk or talks in general about an aspect of writing, he or she is really talking about something that they've built a lecture around. They're making a point. They're making a point that they feel at that particular moment.
Voice is the strongest thing in fiction
Characters make the story.
It's not just that different writers have different opinions about many aspects of writing. The same writer (I speak from experience here) will feel differently about their writing process etc... at different times. They'll focus in on an aspect and maybe get carried away by how they view it at that moment because they're learning something new or relearning something or simply excited about some approach to writing.
I think it's good for the person who is listening to writing advice to be aware of that. The writer may be talking like he's convinced of something--and he is--but that conviction isn't necessarily going to last a life-time. Writing is complex. The continent of writing is vast and writers are constantly stumbling upon new things.
On the receiving end: what's good advice for one writer may not be good advice for another. For example, I teach a creative writing course sometimes and I tell my students to slow down within a scene. That's generally good advice because inexperienced writers tend to rush through a scene. But it is not universally good advice. I may have one writer who includes way too many details. They get so bogged down in details that the reader falls asleep trying to slog through them. AND/OR that writer may be giving the wrong details so the whole scene is out of focus and harms the narrative drive and character development. So that writer hears "slow down" and they try to stretch out their scenes even more, and their writing not only doesn't improve, it actually gets worse.
SO, if you're taking a course, listening to a lecture, in a workshop, my advice is to listen to whatever the writer, writer-teacher, writer-speaker says AND THEN see if it works for you. In other words, writer beware. All writing advice is not for you. One size does not fit all.