You seem to be confusing Masimo's patent infringement case against Apple over Apple Watch with the notion that Apple has some kind of a patented blood oxygen sensor in the iPhone.
I don't think that supports your case that Apple's patent keeps other phones from being equivalent given that the sensor isn't in the iPhone and it's not even Apple's patent.
For what it's worth, I'm typing this on a Pixel which is also a rounded rectangle, so I'm skeptical that patent is really holding other phones back, either
You're typing that on a Pixel with a bump sticking out the back, which would mean it doesn't violate the design patent.
I wasn't specifically thinking of that case, though it's likely why my mind chose that sensor as an example. Apple has patents on blood oxygen sensors, of course, because Apple has patents on basically everything they do. Here's a recent example that I just picked off of Google https://patents.google.com/patent/AU2024216430B2/en?q=(Oxyge...
I'm not seeing how other phones are being held back by any of this. Google and Samsung have design patents, too, and my Pixel Watch also has a blood oxygen sensor.
All phones aren't equivalent, we agree on that right? Apple has legitimate hardware advantages in places. Faster more energy efficient chips. Better earbuds. Various camera components with various advantages. So on and so forth. All of the minor improvements Apple has made will have patents behind them. All of these patents hold all other phone manufactuers back.
Yes, all the other phone manufacturers also have patents. Yes, these also all hold Apple back. That's the deal we make with patents, you invent something, you get a monopoly on producing that thing.
All the other phone manufacturers are basically respecting that deal. Apple is not - they're taking that monopoly and extending it to a monopoly on distribution of software which just happens to run on the device with the thing. This is what anti-trust law, the doctrine of patent misuse, etc should prevent. Either they don't get a monopoly on the things they invented (and all the other phones get better) or they don't get to abuse that monopoly to extract money from people who already purchased the device - i.e. after the patent rights are exhausted.