That tight integration that happens between Apple devices is one of the most pernicious risks. The risk comes because that integration is a potent method of creating "lock in" for customers. Granted, that's true across every tech ecosystem right now, but it shouldn't be. Interoperable technology is the way toward any type of sustainable future, and that's something that Apple's business model is diametrically opposed to (which is why they keep fighting the "right to repair" laws so hard). I've touched on this in a fair few of my articles, like my recent one about the Framework laptop. Cory Doctorow has some great ones as well.
Now, I would say that there are important differences between the smartwatch offerings and, if you really want every possible watch feature, Apple's definitely ahead of the curve in that area. But we have to consider what might be lost -- and that's any hope of technological autonomy. Because once you've invested in one Apple product, it's significantly harder to go back.