When you first start out in most things, the techniques are all that you know, and therefore the only things that you utilize in your practice. Eventually, you just have to reach a level where the techniques are a memory, and it's your soul that starts guiding you. I think this is what gives you good improvisational skills, fluidity, wisdom, or 'experience' in what you do - this, to me, is what I consider 'mastering' something. Although, of course, you will never reach perfection - there is no such thing.
This is just my personal opinion and experience though. I just look back at how things were (how I was) when I started being a musician; and just realize what it's all really about. The techniques I was taught in the beginning provided me with something very important - a foundation. From there I just practiced and practiced, building on my foundation, making it my own. Now, when I go out and play live, I don't even have to think about what I'm gonna do, and how to execute it - it just comes out automatically in my playing. I don't have to be preoccupied with what I'm doing right or wrong; I can just enjoy the music and let my hands do the work. You gotta let your soul guide you. It's a good feeling.
Have that 'connection' with the music.