That’s cool, if that’s what you want to do. Go nuts, have fun. But there’s a reason it isn’t a particularly mainstream way to engage with PC games.
My argument was never for how it is mainstream, but that I find it more useful than regular controllers which I used before and use now. I've found "upgrades" to the xbox, playstation, nintendo controllers with the 8bitdo Ultimate 2. But have yet to find upgrades to the Steam Controller.
You do play mouse and keyboard games on it and love it, and you think it beats sticks because you can spend hours on Steam making overly complicated setups that allow you to macro all sorts of nonses into the trackpads and paddles and whatnot.
And what is mouse and keyboard games these days? Death Stranding, Saints Row, GTA, Dishonored, Uncharted? Doesn't take me hours to set up either. It might takes hours for you to set up, but for me it's been as simple as using a pre saved template for mixed input or mouse/keyboard depending on support and adjusting the gyro and remapping some buttons to my preference.
Same thing I end up doing on a regular controller like the 8bitdo Ultimate 2 where I map buttons of the grip and extra bumper from game to game when I opt for it over the Steam Controller. And same process for adjusting the gyro.
I don’t blame people for swearing by it as contrarians.
So my point is yes for you the controller may be useless, but disagree with the instance that people who like it are doing it because they are contrarians. Hell there's people who take the same stance with gyro trying it out and finding they aren't proficient at it and insisting it is a gimmick.
I hate this thing with a passion.
It does seem like your hatred of it with a passion as you said is leading to too strong of a bias of rejecting the idea that those who like it do actually like it because for them they find it to be a better controller than traditional joystick controller. I will not disagree with you that it is a bad controller for you. It most definitely is with it causing physical pain for you on top other complaints you have. It is a bad controller for you period.
All I ask is that you open your mind to the possibility that people who do prefer it do actually find it the opposite of what yours is, and they aren't doing it for the sake of being contrarian. They do actually use it because they do find it better for them.
Prey was great in that department actually having a config that mapped mouse to the right touchpad instead of emulating a joystick like so many games did, and then had different action sets that automatically switched depending on if it was gameplay or you were in the menu. And showed proper icons like the touchpad click to reflect Steam Input mappings people set it to.