In my enthusiastic endorsement of shikantaza or, "just sitting," I may have given the impression I think a real Zen student would only sit shikantaza, and there’s no place in Zen for paying attention to, learning from, and working with your thoughts and feelings in meditation. I think it's fine to use multiple types of meditation in your practice, and there’s no reason you shouldn’t devote some or all of your meditation time to mindfulness of your thoughts and feelings, if you find that fruitful.