Incline treadmill as premium feature for runners

Why dont develop some features for runnners such autoincline or automatic speed workouts on supported treadmills as premium feature for runners?

Wow that could be awesome. My treadmill doesnt have bluetooth, but I hope they do that so all runners with those treadmills can squeeze the game even more

Yes I wrote premium because I would pay a subscription even if I play zwift only for run if has those features.