Probably something you've already verified, but just in case. Is it certain gpu jobs is the root of the problem and the crashes aren't symptoms of the performance increase gpu jobs provides? GPU jobs increases performance and thus more heavily loads the gpu. Prior to a20.1 low gpu utilization is fairly common and underlying issues with the hardware won't present themselves as often under lights loads. With a20.1 enabled gpu jobs increasing load on users gpus could create conditions that expose underlying hardware problems like, old thermal paste, defective thermal paste, gpu fan faults, unstable OC Settings, Dust clogged fin stacks, inadequate airflow ect. All those issues could result in the game crashing in a20.1 and not a20.0.
I've been doing some benchmarking on a20.1 and enabled gpu jobs makes a substantial difference in general performance. It doesn't help all that much in 0.1% lows, so doesn't treat the root performance issues of a20, but it does a good job of ban aiding it until the bottlenecks can be looked into and optimised.
I've not finished compiling all the data but here's an excerpt of a20.0 vs a20.1 1080p ultra settings
It was great gpu jobs was now being included as stock. It's seems like it would be a step backwards in performance to disable it, especially now since a20.0 in the city's is already borderline unplayable with the frequent and unrelenting stutters. Don't get me wrong if it is actually the cause of the crashes obviously it's better to play with reduced performance over having random crashes. But personally i wouldn't disable a performance feature like this without verifying the crashes weren't caused by something simpler first.
I'm very aware 1 system and 1 users experience doesn't reflect every possibility, but for what it's worth i haven't had a single unexplained crash playing and testing a20.1