You’ll need outside, dedicated practice to get writing down. My current situation is that I have hundreds of kanji I can fluently read, but not necessarily write from memory. That muscle memory is separate from recognition.
I currently do writing practice to make up the gap (using native materials aimed at school children, as well as kanji-test materials, to guide daily practice), but I waited until I’d passed N1 and was nearly done with Wanikani. Just assess your needs. If you’re just looking to survive in Japan, or interact with native media, writing can definitely be on back burner, as reading is far more important. If you’re planning on making a career in the country or just staying long-term, or want to improve your reading fluency even further, writing helps, but it’s not something you absolutely need to prioritize.
So, is it a problem? No, in terms of reading. In terms of life tasks? Maybe, but that’s going to apply to a very small subset of Japanese learners living in Japan, and even then, the speed and efficiency with which it teaches you reading probably makes up for that.