The bit you mentioned about disabled gamer's is why I got my xim.
I was born with a heart condition, and because of how fast it beats it can affect my hand control and sometimes its almost impossible for me to accurately use a controller, I still struggle with mouse but it's far less. Without xim I may as well give up online gaming
There are many Xim gamers with a disability who couldn't play console games without one. The percentage of disabled gamers is higher than the percentage of left-handers.
The perception that we're cheating by using a mouse on console is false, it's simply easier for those who either can't use a controller or don't like using one to aim with a mouse. As TehSubXero stated, there are plenty of padders out there who eat Ximmers for breakfast. However, I'm significantly better with a mouse in my hand than a controller, so for me, a Xim is easily the best tool for the job.
I'm not out to pubstomp controller nubs, I just want to play games with my preferred controls. It's the same reason I own a steering wheel, arcade stick, flight controller and plastic guitar & drums - cheating isn't remotely a factor, it's comfort and immersion I want by purchasing alternative controllers. It's my money to blow and if I want to spend it on arguably better controllers, that's my choice. That doesn't prevent anyone else from doing the same.
The irony with the current Fortnite situation is I wouldn't be a console gamer if it wasn't for Epic Games. I bought a PS3 back in 2007 because Unreal Tournament III offered native m/kb and I loved UT on PC. Unfortunately, the mouse on PS3 handled like a battleship, which led me down the long path to finding Xim3. So thanks Epic, I wouldn't own a Xim if it wasn't for you!