More then once I've had the bad luck to start creating a new Task (and sometimes even create the whole thing) and forget to Export it as a file and save it properly. Suddenly, I've just lost hours of work, of brain power,... and probably shed some tears.
When a new Task is being created, users should immediately be prompted for a file name and a file location where it should be saved.
Also, a SAVE button should be provided to save made to the task once it's been open in ArcGIS Pro.
Basically, the editing and saving workflow for tasks should be similar to the workflow for Models in Model Builder.