IMO, the controller & software is the sweet spot and gimbals are somewhat, a dime a dozen. Not saying some aren't better than others, but they can be built with a little common sense and a few tools.
I personally hope the CP and firmware just keeps getting developed and improved. There is already a crowded marketplace with a competent group of gimbals that are ready to fly and generally they are on the higher end of the price range.
I have been one of the lucky ones who has not run into any major issues with the CP. It has worked. Been a hiccup here and there and I have been pretty vocal about begging for improvements on the horizon. That being said, on a assembled gimbal I purchased and on my DIY, both using GH3, GH4, and a short test with my 5d MK II, it has just worked. Very seldom do I get unusable footage or surprises.
I'm don't fly fast nor I do it under pressure of customers eyes, but in terms of getting the footage I expect and having the gimbal work, this is as good as I need....
Features, reliability, and tightening up the horizon are, IMO, the only thing you need to work on. Be the brains, let others build the bodies, whether it be small, medium, or large in size. Focus on what you do good.