I would add that historically, most musicians did not read music or theorize. They were practitioners who picked up the skill by listening to others, practicing, and improvising. Improvisation was what historically characterized musicianship, not theory, not sight-reading.
As the philosophical joke goes: anything you can do I can do meta. Theory is about music; it is not the practice of music. You can learn as much theory as you want, but theory is not practice. Theory can, of course, later sharpen or lead you to certain insights that can shape the music you produce, but practice is what produces facility, familiarity, and understanding, whereas theorizing produces knowledge. Learning theory too early is a pedagogic mistake. By analogy, consider speech. You don't begin to speak by learning grammar first. You begin by practicing. Only later can some knowledge of grammar help, perhaps. The way you become good at speaking is by practicing, and what is speech if not some combination of recitation and improvisation? Reading is entirely incidental and secondary.