Unfortunately I don't know specifics about certification process so I might be totally wrong on this one but I have a gut feeling that this is not Intel who does not certify Thunderbolt 3 docks otherwise there should've been no PC laptop Thunderbolt 3 docks out there... I believe this is Apple monopolizing access to MacBook Thunderbolt 3 devices market. If you look at the situation under this light, seeing LG UltraFine 5K display being certified half a year before any other similar device is quite telling this is either preferential treatment from Apple or inside knowledge (aka it's not delivering power per TB3 standards but rather in a proprietary Apple way). This is totally speculation but I just cannot believe LG has more expertise in TB3 devices (having had no experience with such devices I believe) than Akitio, OWC, CalDigit etc etc altogether.A question that I have is how LG have been shipping what is essentially a Thunderbolt 3 dock with full power delivery capability since December in the form of its UltraFine 5K display*, and CalDigit, OWC et al. have nothing to show a third of a year later.
If I was them - I had a working product, but that Intel would not certify for whatever reason - I would be shipping regardless, without certification.
*Insofar that it is turning a Thunderbolt 3 connection into two almost 4K, 60Hz, 10-bit video streams, plus a USB 3.0 hub, webcam, microphone, and audio, whilst providing 85W of power delivery.