I highly agree, feeling and theory are equally important.
As I have mentioned before, I’m in my beginner stages as a musician, though I am not completely unfamiliar to music. I used to be able to play a few melodies on piano, and I can name all the keys on one as well as read simple sheet music.
But I’m still learning to just being able to just play what I think sounds good, and I think that’s essentially one of the question music theory answers. Like why does some chords sound good together, while playing two keys (on the piano) next to each other sound not so good.
I personally think the harmonica is excellent in conveying both theory and feeling, since it’s a easy instrument to carry around, whilst also being very diverse in it’s ability to create sounds.
I hope I am making sense 