Well, these days it seems Linux drivers get enough eye-balls on them that anything meaningful is going to get looked at. Sure, I expect there are some low usage drivers in the repo that just haven't had enough mileage. At least with Linux I can see the driver code. (The second day at my current job, somebody pointed me at a bug with an obscure symptom. A quick check of a log file showed a 0xE exception. A couple hours later I posted a link to the bug in source. Somehow, the universe decided to give me a bug I had seen many times before to get my reputation off to a good start -- it's better to be lucky than smart.)
At the dayjob we have lots of sporadic problems with USB drivers of Linux in our fleet of embedded devices (RPi). I had a lot of problems with USB-C and Thunderbolt docks in last 5 years. If USB doesn't get enough eyes to not crash/freeze systems entirely, I don't know what else would get. Monolithic kernel design should have belonged to past but we don't get nice things.
