RAM speeds on Kaby Lake

It was interesting to note that one boutique builder of laptops with 7700K processors had to reduce the clock speeds of RAM memory due to stability issues. While there were offerings of 2666 and 2800 MHz available they had to dial that back to a maximum of 2400 MHz DDR4.

Since many of the high end 7th generation "K" series laptops from different vendors are all based upon the same platform do you think this is a temporary "speed-bump" until firmware catches up with the slight differences between the 6700K and 7700K processors? Or is this a longer term issue due to hardware incompatibility or chipset problems?

You would hope that RAM speeds would continue to increase instead of plateauing and then retracting back to 2400 MHz. This may be a problem that is unique to laptops running desktop hardware (A.K.A. motherboard manufacturer issues) so desktop users may continue to see DDR4 approaching 3866 MHz.