The staff mentioned earlier that some of the processors experiencing this (CPUs, not GPUs) haven’t been supported since BFA launched. I saw there are a few cases where they meet min specs and still have issues, but it isn’t as common.
And I know I keep catching heat for this, but I think Blizzard has been very reasonable in their response to this issue when you consider they ended the support for those processors in 2018. As Nosaferatu said, everyone is just trying to do their job and carry on.