Fusion not for pain relief
It is a last resort, in your case if the cervical facet syndrome was causing a critical level of spinal cord stenosis.
Fusion often creates more net pain than it relieves over time in most cases. you are often just trading types of pain. Plus, One fusion often begets the next fusion, etc. The downside and risks of fusion in what you describe is significantly greater than any lasting benefits you might get.
I know it is very hard to accept that there is no surgical fix for pain and some physical limitations.
Severe DDD, Severe neural foraminal stenosis at 2 levels, moderate canal stenosis at 2 levels, significantly impaired left shoulder & arm function. Chronic moderate compression fracture at C6.