A long, long time ago, the AAA games company I worked for received beta versions of the newfangled Steam Controller from Valve. I was very excited about this! So excited, in fact, that I spent a frantic weekend adding support for this newfangled controller to the game we were working on. What can I say, I was young and dumb. (I'm old now.) And it worked flawlessly! Well, mostly flawlessly.
But when I showed my work to the CEO, he was less impressed. He pointed out that there were some wrinkles with how we displayed button prompts, as they would continuously toggle back and forth between gamepad and keyboard prompts when using the Steam Controller. Because this controller was treated as both a gamepad and a keyboard/mouse, it turned our input handling into a tangled ball of spaghetti. And finally, there was the very slim chance of uhm... the game crashing on startup. But it was a very small chance! Like 0.1% or so.
So, yeah. We decided to scrap the support for the Steam Controller. Because 0.1% of our playerbase would have been three to five thousand angry posts on the Steam forums.