Before you start making plans to evict your current rig, I want to explain how the Steam Hardware Survey actually works. Rather than representing every player that uses the storefront, the monthly census instead uses a small percentage of participants who've opted in as a sample. It's anything but representative of all 154 million active users, meaning the statistic above isn't an absolute.
Does the author know how *survey sample sizes work?
I would assume not. I've never had to install a specific driver for a generic controller. My levered and leverless controllers worked out of the box. It's just plug and play.
I would assume most controllers follow the usb hid standards and it's support is already built into the kernel. Same with Playstation controllers as well. Sony hid is inbuilt and steam hid is inbuilt. If the new controllers require new drivers it's going to be made a standard and be included in the Linux kernel so the controllers will be plug and play for all distros.