personally, I have lots of gaps in my knowledge of music theory but as long as I can do what I want without understanding the details I am just fine with that!
Now, Eddie the Devil's Advocate wants to ask you this question.
Do you think that what you could do would be at all enhanced and expanded if you knew more theory? More complex chord progressions make for more interesting songs. 1-4-5 is fine. A lot of songs are simple 1-4-5 songs. When you learn why and where that 2min and that 6min or that 3maj fit into those songs, imagine the possibilities.
Of course you never HAVE to learn more about music, but it's my personal belief that when you stop learning you may as well die. And that means learning about any topic. I am looking for a college that offers and will let me audit wind energy technology classes. It's not like I want to look for a job as a wind technology engineer (at 64). I am just interested in learning how to make wind become AC power. Solar interests me too, as does the European (Denmark was it?) technology that put devices underwater to allow the waves to move large panels and that somehow creates energy.
I have never been a "get along as is and never grow mentally" person. And to those who choose that path, you be happy with how you are an you owe no explanation to anybody.
The three things I live by:
Don't die with your music still inside you.
Lead, follow, or get out of my way.
Good enough isn't good enough.
Disclaimer: This is me and I am not suggesting you should be like me. You focus on being the best you that you can be!
Edited by Eddie the anal retentive, OCD Devil's Advocate to correct a spelling error.