This is probably the answer. Most motherboard manufacturers stayed away from using the CPU for the M.2 slots because of the question marks of lane support. The specs include both as supporting SATA as well as PCIe. So chances are instead of sharing ports, they decided to just dedicate 2 of the 8 to the M.2 slots.
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keebs63 - Tuesday, October 31, 2017 - link
I don't understand why all of these X299 boards aren't using the full 8 SATA ports provided by the chipset. Is something else using up the lanes?achillea - Tuesday, October 31, 2017 - link
It looks like the 2x M.2 support both PCIe and SATA so that should account for the remaining ports.Topweasel - Wednesday, November 1, 2017 - link
This is probably the answer. Most motherboard manufacturers stayed away from using the CPU for the M.2 slots because of the question marks of lane support. The specs include both as supporting SATA as well as PCIe. So chances are instead of sharing ports, they decided to just dedicate 2 of the 8 to the M.2 slots.CheapSushi - Thursday, November 2, 2017 - link
Plus, an ATX "workstation" board without full 7 slots...especially when we finally get more decent PCIe lanes.dirkh - Wednesday, November 1, 2017 - link
not bad. still waiting to see what Asus is going to do with C422jagdpanther - Sunday, January 7, 2018 - link
Anyone know where I can purchase an Asus WS X299 Pro? As of January 7, 2018 I can't find them anywhere.jagdpanther - Friday, May 11, 2018 - link
May 11, 2018 and the WS X299 Pro (not the SE version) is still not available in North America.