I agree that the Apple Watch is the best smart watch on the market, because it looks reasonably elegant so it can be worn pretty much in any situation without looking like a plastic clock taped to a wrist, it’s tightly integrated with the best cellphone operating system on the market and it has a wide range of apps that give it a spectrum of usefulness. It’s also good at providing some background health / activity data that is useful in helping people get fitter than they were. Compared with a Fitbit it is a no-brainer, but it’s an everyday watch that is an extension of a cellphone.
I love my Apple Watch, but compared with a proper fitness device it’s way behind. Have to looked at what Garmin as one example is doing? Training plans, integrations with specialist sensors like power meters and foot pods, many more metrics both measured and extrapolated, recovery times, real time performance condition indication, customisable screens built from dozens of available data elements, specialist metrics for all kinds of sports - all this on products already on the market when I last paid much attention in 2016 that the Apple Watch is still nowhere near. The battery life of the AW in itself makes it laughable for serious training work.
That’s all OK, because that’s not what Apple is making the Watch for, but don’t try to pretend it’s the best on the market at fitness tracking.
I agree Apple usually doesn’t release hardware until it’s full featured and working, but there‘s a whole industry built on making alternatives to Apple‘s software for Apple devices, either because they are more specialist or they just are better. Have you looked at third party heart monitoring apps? I use two and both run rings around what Apple’s Health app can do.
We’ll see what sleep tracking brings pretty soon, but I can tell you now it will be fairly simplistic, consumer focused and light on features. Doubtless it will look slick, and it will make some basic stats about sleep very accessible, even “gamified” - very much like the three rings do for activity - but I have no doubt the deep analytics will be left to third parties just like it is for activity, heart rate etc. Apps like I already use in other words.