@Tom-Struzik The way I see this is
Suunto wants Bluetooth connection to only go to the proprietary app. Since other apps can connect to it via the API (the way hundreds of apps do), that should be possible.
Likely Mares instead wants direct access to the Bluetooth of the device, to sync directly. This will likely never happen, because how can one expect Suunto to give access to their devices to a direct competitor?
I don’t believe either of these will change; but it’s tangentially more likely that #2 might change, as #1 definitely won’t (and for good reason).