The focus is on doing your workout properly and being able to adjust it on the fly according to how you feel or also to accommodate issues with sensors/devices (eg differences in power accuracy, fluctuations, etc). The web editor is very good. It should be incorporated into the app so that one can edit the workout easily (for instance the Training Peaks workout of the day) just before starting. The app will likely be improved in many aspects in the coming months, but is already now a good replacement for zwift and other more expensive alternatives.