Vendor ecosystem lock-in triumphs again.
It felt a little weird paying more for my Apple Watch than I did the iPhone SE it is paired with, but I've grown to really love them both. Sometimes the lockin enables cool stuff.
They can pry my iPhone SE from my cold, dead hands though. I could suffer through buying a nice Bluetooth adapter for my custom IEMs if I had to, but I won't get a phone that can't physically fit into a pocket - and I own pants that can't fit an iPhone X sized device.
I'm not saying a closed ecosystem is somehow "right" by design, but Apple's proprietary augmentation of Bluetooth sure makes me forget that the watch is using it to talk to my phone or laptop. Maybe its less that closed ecosystems enable cool stuff and more that end-to-end control makes it easier to ensure your cool stuff works properly most of the time.
Closed ecosystems make money very directly by locking in the customer. The vendors will invest heavily in it and it will pay off, hence the "proprietary augmentation of Bluetooth sure makes me forget that the watch is using it". They will not share the tech, by working on an open standards or open tech, because that way the competition profits as well. This is just greed, anti-competitive market abuse, it's not more complicated than that.
apple does absolutely nothing to make bluetooth invisible and force you to pair it using an iphone based app just like any smart "thing" including apple watch, fitbit, etc.