With apps we will have solved some limitations we have:
Interval complex structured workouts: we could have training peaks app or data field.
Follow a plan: TrainingPeaks, FinalSurge… whatever you like.
Custom data field: ascend speed, running effectiveness, virtual partner…
In cycling the apps are very important in the indoor sessions: Xert, Zwift workouts…
Swimming: There are apps from external platforms in iOS and Garmin where you can follow a plan…
I don’t think we will see it in the actual spartan/5-9 watches… but once the ambit 3 is gone… maybe…