The problem is less with theory and the knowing of it than it is with elitists and musicologists.
Pete Townshend once made a telling point when he said there was too much analysis in rock and roll. But that came about as a natural response to elitists telling anyone that would listen how simplistic and small minded rock was.
The truth is that theory in music and in particular applied to specific instruments has not developed in a vacuum.
Theory is born of practice.
People over the centuries found that certain things 'worked'. Certain combinations of sounds and notes seemed to go well and were sometimes composed of very similar elements. Solid theory developed from
this. Theory should be ever evolving because every now and again, new relationships are discovered.
One of the problems with theory is theory itself, becoming a fixed, unalterable, rulebound straightjacket. There are those that wield their knowledge like a Sith with a lightsabre, ready to cut down ewoks, Jedis and stormtroopers at will. There are those who seem to be hamstrung and straightjacketed by musical theory instead of just using it as a liberating tool when necesary. Mind you, non theorists can be just the same. No offence but "Three chords and an attitude" can be just as elitist as the "theory is all" philosophy.
To a greater or lesser extent, virtually all musicians employ theory. Because it is born of practice. It should be liberating, something that's kind of unconscious except in those instances when a little more conscious application is needed. It's like putting up shelves or something. It just assimilates into one's being after a while. But there may be a time when, for whatever reason, you need to remember how to get straight, solid and level and there you go....
However you make your music, just enjoy it. Rest assured someone will hate it ! But someone will dig it too because people are strange..........
Nothing beats a good bit of
chumpitaz !