I personally like the direction and additional details that a textbook offers. The resources pointed to on Bunpro are often well written and accurate, but because they are often from a wide variety of sources, there’s often a disconnect in perspective and terminology between sources that can be difficult for a new learner to reconciliation. A textbook on the other hand is usually written by one author who maintains a consistent perspective and terminology throughout the textbook. Furthermore, textbooks often take more time to establish the bigger picture of Japanese language that you simply can’t get just by knowing all the individual grammar points.
Whether or not a textbook will help you personally is up to you, but if you think a particular textbook would help you out, I encourage you to pick it up. A bit of extra money spent to help learn something faster or more effectively is one of the better ways money can be spent.
If you’re looking for recommendations, I’ve found 80/20 Japanese to be a good introduction for new learners at a beginner N5 level and is pretty cheap at $40 if you’re willing to get the e-book version. If you’d like to look into it, the author has multiple sections from the book available for free up on his website if you’d like to look into his writing and teaching style.