Supply chain/logistics. I've been simultaneously surprised and unsurprised by the relatively minuscule number of people interested in driving technology and change for this space forward compared to other spaces.
Despite best efforts, even among the largest lines (Maersk + others via DCSA), EDI still reigns supreme in this space. Nothing inherently wrong with EDI itself but there are plenty problems with access. Port & terminal level visibility are in an even worse place.