Who produces the work and who reads it
Domo and Hex meet when a company is deciding what the backbone of its analytics should be. With Domo, the deliverable is a page of Cards that a sales leader or plant manager opens every morning, maybe on a phone, maybe because an alert fired. With Hex, the deliverable is a notebook or published Hex app where an analyst has worked through a question in code, added charts and narrative, and shared the result.
Neither is wrong; they are built for different authors. Domo's Magic ETL and Beast Mode let people who do not write code shape data and add calculations. Hex assumes the author is comfortable in SQL and Python and rewards that skill with flexibility a dashboard builder cannot offer.