What?
- the battery isn't "weak". You don't think Apple would have made it last longer if they could? Design decisions and compromises were made - battery life is probably the strongest argument for a Garmin/Suunto/Coros but it's a really different audience. I run ultras - my Apple Watch easily lasts the typical 5-6 hours tracking an activity. If I go longer or the conditions are gnarly then I break out my Garmin, which is frankly a bit weak for every day stuff.
- Which features are weak here? The metrics out of the watch are fantastic, especially the later ones with more sensors. Also AW4 arguably set the standard in accuracy for wrist mounted OHR.
- I know nobody who has had issues with the SpO2 sensor, truly first I've heard of it. Jumping around while trying to measure anything with a watch will cause problems...
- If you want to do this then I think it's reasonable to buy an HRM strap. It's an edge case and often there IS a Watch or Phone app that will pass this data through but perhaps not realtime.
- ANT+ is owned by Garmin, a competitor, even though it is an open standard. I suspect the % of people owning the 180 million Apple Watches seeking ANT+ support is vanishingly small and for those who do want it, Bluetooth is there. And if you
really need it, then there are various passthrough gadgets like
heartbeatz although I don't know if it does power and cadence etc...
It looks like you prefer a different focus and setup to that catered for by Apple. But calling it "severely antiquated" is ridiculous!