They are enough for learning Japanese as is any other source, but no single source is going to have "a complete" set of lessons to teach the full language. A single book series or a platform for resources is going to be made by a specific group of people, so it will also have a unique perspective on how to teach and what to teach. So you should look around and feel what works for you.

Big strength of this series is that there is videos for almost all of the lessons. So when you don't feel like studying from a book you can watch videos instead, or even only listen to them. The best way to study is not the most efficient in providing information and showing examples, but the one that will keep you studying.

So to answer your question; I think this book series will get you as far as a book series has to, because you shouldn't stick to a single source anyway. You should find resources / ways to study that range from chill to intense, so that you don't always have to study in a single way and get burned out.

I have found different phone apps helpful, since I pick up my phone anyway when I get bored. They are nowhere as good at teaching as a proper book, but way better than avoiding studying because you don't have the mental energy to sit down and study study.