Put it this way, compare yourself to a car mechanic. OK, so on the one hand you've got mechanic 1 that turns screw X because it gives the desired effect of Y. Then you have mechanic 2 that picks a random screw in the hope that it'll do something or other to the engine.
Ok, story over. Back in your studio now, when you look at your synth, do you know what the filter cutoff does? Do you understand how the LFO creates movement in the sound? Do you know, before turning a certain knob what it'll do the sound? If not, you are mechanic 2 my friend.
Consider now that this example regards synthesis only. The same example could be used to describe Sound Theory, Composing, Arranging, Harmonization and so on and so forth. I know many people disagree with me, but in my world you are like a blind man trying to complete a 25000 piece jigsaw puzzle without a theoretical grounding. No doubt someone will jump up and say "nah, cause so-and-so make fantastic stuff and knows f*ck all about theory". In many instances true, but then they have other people that does the advanced stuff for them. Most of us on here do not have that luxury, I'm afraid.