Currently, the pipe creation tool does not remember the previous setting.
Every pipe that I have created in my model has an OD of 10 mm. When I attempt to create a new pipe (using 3D splines), Fusion uses 25 mm or 50 mm--both of which frequently result in error messages that bog down the software (there is a delay after I change the diameter as Fusion thinks about whether it will create a legal feature or not). Fusion also does not remember the Operation (I am creating each hose as a different component) nor the Hollow selection.