XPS 13 9350 won't turn on with Thunderbolt 3 enclosure plug.
I have an XPS 13 9350 running the latest Thunderbolt firmware from Dell. The XPS 13 doesn't boot when a Thunderbolt 3 PCIe enclosure is attached (Akitio Node Pro). When the TB3 enclosure is plugged in and the system turned on, the front light flashes twice white, three times orange (and repeats several times), then shuts off.
I went with the XPS 13 (and it's high cost) due to the TB3 expandability... which seems to be extremely rough. I mean... I guess this explains why Dell pulled their TB15 dock (which I also have, and yeah.. it "has major issues" too).
Honestly, after updating to the latest Thunderbolt 3 firmware, the system seems less stable when hot-plugging the TB3 dock.