Apple Watch: Add indoor workout distance & run categories

I own a spin bike and a rowing machine and regularly complete workouts recorded on my watch - but why can’t I add data to show the distance I completed on each machine? I understand calibration of static machines vary, but that isn’t a reason to not allow data to be added for personal tracking of goals etc.

When I go for a run why can’t I edit to say what sort of running I did - intervals, hill sprints etc?

I don’t want to change any of the recorded data, just add to it.

Garmin have allowed this for years so why can’t Apple?