Apologies if this has been asked but what am I if anything missing but not foliar feeding my plants?

Since all of my past growing experiencing were in an environment where I battled to reduce humidity any way possible, I never foliar sprayed in fear of helping mold/mildew form.

now that I have my current grow in a significantly safer and more controlled environment it seems I keep reading on regular foliar feeding and even some regiments on it. I haven't sprayed my babies once and I don't think I even own a spray bottle - but i was sitting here thinking, "Well what am I possibly missing that I'm not?"

is there some giant benefit or is it more of a "fine tune benefit" that isn't drastic but still real. I mean I saw one guy spraying his plants with milk , like what about chocolate milk?? haha

- cirro