The reason writing is important for making a comic is that a comic should ideally be a perfect fusion of words and pictures working in harmony to tell the story. The reason a lot of people are telling you to just go make a comic, is it's really hard to teach somebody else. Comic storytelling is a tricky skill to learn, and there's no 100% right way that works for everyone.
Maybe you'll be the kind of comic storyteller who uses a lot of narration, or internal monologue, like a lot of Korean webtoons do. Maybe you'll use a lot of annotations like Bryan Lee O'Malley, or maybe you'll be like me and make comics almost like a movie or a show storyboard with almost no narration or internal monologuing.
You kind of have to find your voice for yourself through making things and seeing how readers respond to it, but also seeking out good comics or books on art and writing to see what you can learn. Having seen the Neil Gaiman masterclass, I think that's a great place to start; he has a lot of great wisdom to share. Reading "Making Comics" by Scott McCloud is, in my opinion, essential, and every comic creator should read that book.
Once you understand how you're using the words, and how you're using the pictures, and how you break down your story outline into panels; what you tell as narration, what you show as a scene, where you use flashbacks, where you use exposition, you'll start to get really good at pacing a story, and you'll get stuck less and so get faster at planning a comic, thumbnailing out pages and getting to work on making them.