You frequently point out exceptions like it’s the case for the majority, it’s not and doesn’t disprove my point. Most will work fine out of the box.Apple uses app icons that don’t work well in a circle format themselves as I earlier mentioned. With some apps it doesn’t make sense to change the whole icon design to support devices you have no intention of supporting. Case in point, Final Cut Pro has no circle version icon for watchOS or visionOS because it doesn’t support those platforms. Apple doesn’t say to use one icon that can used on all platforms in all cases, in fact, they have very different design guidelines for each of their platforms. Even watchOS and visionOS icons have different design guidelines for icons. macOS has different app icon design guidelines than iOS and iPadOS. And they require separate iterations of icons to perfectly follow these guidelines, just like Apple makes separate iterations of their own icons for these platforms. So it isn’t as simple as you are making it sound.
And yes, I do care about this, and so do many other people. I think it would make much more sense to make this an optional theming option, not the de facto one option that everyone is forced with. And luckily I think Apple would make it optional if they do it, just as they did with dark mode icons which was a far less major and controversial thing.
I personally don’t really even think they will go the circle route, but if they do I’m pretty sure they will tell the users and devs who complain to suck it up.