I bought the CPU a month ago. I did not face any USB issues (I'm using a keyboard, mouse, webcam, usb hub, an external sound card, and I used a USB stick to install the OS, and occasionally I transferred data to USB sticks).
In fact, my motherboard is AsRock X570 Taichi.

AsRock X570 Taichi (AM4, AMD X570, ATX)

I'm using Linux, Ubuntu 20.04.

I've been using the 5950X for over a month now, and haven't noticed any problems with USB.

My USB devices include:
- Keyboard & mouse
- Webcam with Windows Hello support
- Screen with integrated USB hub
- Xbox One controller
- Charger for wireless headset
- 3 different chargers

I'm also using both internal USB 2 headers on my mainboard for some Corsair iCue RGB LED and fan control hubs.

Aside from the CPU, my PC also includes:
Mainboard: ASUS ROG X570 Crosshair VIII Dark Hero
SSD: Corsair MP400 8TB M.2 SSD
GPU: MSI RTX 3080 Gaming X Trio

Both mainboard and GPU support PCIe 4, but I haven't been able to verify if I'm actually using PCIe 4 or not.

Due to Corona, I've had to use my webcam for hours at a time, that's how I know I don't have any problems with USB.
Seems the issue mostly concerns people with VR/AR/MR headsets. I don't have either, which might explain why I'm not affected.

None on this chip or the 3950x that was in the motherboard before it. I have a Gen 4 m2 SSD but no Gen4 gpu (not for lack of trying.)