I'm thinking customers arent liking spending $750-800 on a CPU (5950x) only to find out they spent all that extra money without receiving any of the HEDT benefits, as it's still on the mainstream boards. Imagine building a $4000 rig and having it limited to mainstream boards. The bottom end HEDT for AMD is $1400, which basically says AMD is defining HEDT's price at over $7000.
What are you putting in a $4000 rig?
$400 64 GB RAM
$750 RTX 3080
$250 2 TB main SSD
$600 4 TB steam SSD
(And the only "extra money" being spent is the $200 difference from the 5900X)