The built in Stair Stepper activity on the Vivoactive 3 doesn't offer very much information in Connect and just seems to be a rush job to add an activity. It only shows total time and heart rate information. Indoor Walking shows more information than this, like pace, speed. This information should also be available.
During the activity, the watch shows more information than Connect. For example, floors climbed per minute. It would be nice to see this extra information in the Connect charts and summary. I'd like to compare my heart rate with the rate of floors climbed.
Considering the Stair Stepper activity is a marquee activity on the VA3, I don't think it deserves to be an activity at this moment. Garmin development needs to improve this.