With or without using Steam Big Picture game controllers (I’m using xbox one) don’t work in menus and in keybindings settings. Gameplay with controller is good, but lack of support in menus kills consistency of experience.
It is something they would like to add.
I have created steam controller config to optimize gameplay and make navigating menus possible. If anyone is interested it is published in community configs with my nickname.
For developers: it would be great if auto-aim option reappeared in settings. Most of gameplay on controller is pleasurable but in few situations scene is crawling with enemies and survival becomes so much harder than when using mouse. Precise shooting distant enemies on controller without auto-aim is almost impossible.