Just from top of my head: on-device AI, way better screens for a bright sunlight, great out-of-the-box connection with the ecosystem. Those SW features are dependent on the invisible HW upgrades. But I'm not a tech guy. And I feel it is quite mature now, so I wouldn't mind less changes and longer lifespan, even though 7 years should be ok. In my family we do 4 years us and then 3+y parents.