The forums are largely community-supported and not a guaranteed point of contact for staff. So if you’re opposed to community assistance and have a special need to speak with staff only, you will want to use their ticket system for that. They may come across your thread, but that’s also not guaranteed. However, keep in mind that many members of the community do have hundreds or thousands of hours related to troubleshooting game problems.
As far as this issue goes, it’s not as common as it may seem. Many threads about this are from years ago, and it’s impossible to know what the hardware/software/addon setup or issue was with each computer without employing some troubleshooting steps.
If you have an older hard drive still in the system, this could drag performance down. Additionally, more information than “I have a very high end PC” would be needed to make any definitive statements about the hardware’s ability to perform well with WoW. A DxDiag report should be included with all new technical support threads, per the instructions at the top of the forum:
Edit: If you add the report, someone in the community (maybe me) might be able to take a peek at it for you. Otherwise, you’ll probably want to open a ticket, which will also require the DxDiag, along with another system report.