"Many customers" meaning people and orgs running server software on direct hardware. Does your caching or database server run user provided code? Is it accessible to the outside in any way? If not, then maybe it doesn't need the patch.
lol, javascript
So? Many does not mean most. There's a choice to be made, apply the security patch and accept the performance loss, or don't. Some people may not need to to remain close to as safe as they were previously based on their configuration for some of their systems, and I would guess the number of systems easily numbers in the millions. This is a benefit for those people, and worth mentioning, even if it's not nearly a large a number as the total number of CPUs or customers.
At least, that's all I can think you are trying to imply, because you didn't actually say anything, you just dropped a link. It's hard to have a useful conversation when that happens.