It’s helpful to have flow diagrams accompany design files so devs don’t have to have flip between windows, but currently diagramming tools are only in Figjam (to my knowledge). Although you can copy a diagram to a design file, you can’t update connectors, shapes, etc. That causes the need to edit in another place and copy it back over to the design file.
Please give the design tool the same diagramming functionality that Figjam has. If it’s a matter of pay-to-play, perhaps you could only make it available in the design tool if you have Figjam.