Well I'm glad we had this discussion. As if I hadn't already regretted investing in this title due to the absolutely dead public online experience, now I am expected to get a 500$ FFB wheel too.
My Logitech Momo FFB still feels fine (well, for Momo standards at least), so it's certainly not a general problem with older Logitech wheels or the 5.10.127 driver.
To the others who have this same problem. I was informed by Sector 3 that to get real support you must create a ticket via their support system: https://support.raceroomracingexperience.com/