When I left the UML world 15 years ago what was being worked on was the model. Not everything in the model has to be expressed in the diagram(s) - that simply m

When I left the UML world 15 years ago what was being worked on was the model. Not everything in the model has to be expressed in the diagram(s) - that simply makes the diagrams unusable. The problem is UML "grew up" being diagram-based, which can't be round-tripped. Too many people rejected the model approach and the two factors I identified were then able to kill it.