If it ain't broke, don't fix it.
Ehh, I'm not sure. With that logic, we would still be using a d pad with 2 buttons.
The steam controller is the most fun I've had with a controller since the N64 controller. That doesn't mean it's the best controller for the job, but it means that it's the first truly unique controller experience I've had in a long time. Maybe aside from the Wii, but my issue with the Wii was merely that it tackled a large problem with a small solution that didn't scale well as more precision was desired.
I'm still using it every time I game but milage may vary. Because of the length of time and dedication needed to perfect your bindings, I think playing one game for a long time is better than trying to play every game in your library in a month.
Though it should be said that, having looked through the bindings that currently exist on the community, the controller's biggest issue is that it is really easy to let the user accidentally make a bad experience for herself. My thoughts are that many people make these "High Idea" bindings which use every feature under the sun, or try to make heavy use of mode shifting, or have some strange experiments where the pads are used to swap the movement view around for lefties, etc.
My point is that many bindings can be made simpler by focusing on simple concepts, and making use of multi button binding to double up the usage for a button. For example, in skyrim I double bound enter and space to the a button, which has no game play effect and gives you a way simpler interface for navigating menus and the like without having to resort to crazy mode shifting or super experimental track pad settings.
To put it simply, designing a configuration should really follow the "Keep It Simple, Stupid" mentality.
Speaking of which, I actually suggest some people spend some time playing without haptic feedback on the track pad for mouse movement and see how it feels. Some friends of mine performed better and felt a lot better about the controller when it was disabled, probably because the haptics can sometimes be so good that it becomes distracting. I have been playing with it disabled myself and while I do like the hatics for some reasons, I find that people haven't shared stories of people who prefer to have it disabled.