If you like it, use it. Why not let other people augment the ecosystem? If Apple allowed Pebble to get full permissions and it all turned out to be the extremely unsafe, buggy disaster that everyone here chooses to portray it as, then you can still buy an Apple Watch. In what way does shutting out the competition benefit you?
How many users do you think call Apple everyday to complain about issues with their third party, knockoff AirPods lookalikes? Could you imagine why Apple could be protective of the user experience of their hardware and sensitive to that user experience being compromised by poorly implemented or nonfunctional peripherals? For every Pebble user, how many people might buy ripoff Apple Watches?