Well the answer starts with speed, but it's not the obvious reason. Finishing a model fast is certainly a nice sense of accomplishment in terms of getting things done. Beyond that though is the fact that if I'm turning over models quickly, then I feel like I'm more free to experiment. I'm actually more roadblocked by getting models assembled. This whole thing is quite freeing and makes me want to paint even more.
It's also just expanded my skill set. I'm using paints I never used before (heavy body acrylics) and using the wet palette far more than before. I'm thinking more carefully about light and value. I'm being even more accurate and controlled with my brush. Heck, I'm even forsaking trying to watch Netflix while painting and just putting on my headphones and focusing on my painting to a level I've rarely done before. All of this together is both challenging and empowering.
So where do I go from here? Well my next goal is to figure out how to make the SketchStyle technique more of my own. I have no idea what that's going to look like though, so this should be interesting.