I agree that it's not appropriate for every day, all day use. However, it's not possible to eat 16 kale leaves, 8 celery stalks, an entire English cucumber, 2" of ginger, 4 apples, and a lemon all in one sitting (at least not for me). You can get all of their nutrients, though, from the juice. Also, there are two types of fiber -- soluble and insoluble. You're still getting soluble fiber in juice.
I enjoy the taste of the juices I make, and I use them not as a replacement for solid food, but as an addition to my usual solid-food diet. It's refreshing on a hot day, and we have plenty of those here in Phoenix. It's a lot healthier than just about any packaged juice, soda, etc. (Packaged juice bought at a store is an entirely different thing.) And on the scale of things that are good for you versus not, mostly-vegetable juices are pretty far on the "good for you" side of the scale. I'm very, very particular about my diet, trying to keep it as whole-food-plant-based as possible, but no one is perfect, and if the place where you "slip" and treat yourself is with vegetable juice, then I'd say you're doing pretty well.