Comprehensive music study is a multi-faceted thing.
Learning to play any instrument can and does focus largely on technique, i.e., how and why to touch and interact with an instrument in order to produce sounds. This includes learning keyboard and fingerboard layouts, note fingerings for wind and most brass instruments, etc.
Music theory study is integral to playing an instrument well in that it teaches players when and in what manner to manipulate the instrument in order to produce sounds of definite durations, rhythms, and dynamics.
B2B is an excellent example of a beginner course that teaches technique as well as the introductory fundamentals of music theory.
There are many excellent music theory books and online teachers that can take players further towards mastering the subject. The trick is finding the ones that click with you.
Some (many) teachers’ styles are too…something: dry, boring, annoying, disorganized, amateurish, overly cerebral, just plain lame, etc.
That said, there’s something and/or someone out there for each player who wants to learn more. You just gotta be prepared to kiss a few frogs in order to find The One.