For swim workouts that have full HR data, the hrTSS seems to be a much better measure of workout intensity / fatigue than sTSS (swim TSS).

The ability to set swim workouts to either hrTSS or sTSS as a default would allow users to chose what works best for them, and not have to remember to adjust / change after the workout.

Currently, ALL Swim workouts default to sTSS.

I see this also shows up for trail running as well.