Sleep Apnea is available in the Series 9, so besides the display there’s not as much reason to upgrade.
Going back a few Watch generations it’s pretty easy to see a pattern in updates:
- Series 4
- Last time we got all three: Design, Processor, Health Sensor
- Series 5
- Same Processor/Design/Health Sensor
- New Display
- Series 6
- Same Design
- New Processor/Health Sensor
- Series 7
- Same Processor/Health Sensor
- New Design
- Series 8
- Same Design/Processor
- New Health Sensor
- Series 9
- Same Design/Health Sensor
- New Processor
- Series 10
- Same Processor/Health Sensor
- New Design
As you can see Apple seems to be updating the Watch design every 3 generations (4/7/10), roughly doing the same with the processor (4/6/9).
Following the same cycle we can expect the Series 11 to have a new health sensor, while the Series 12 will likely get a new processor in 2026 based off the A19 used in the upcoming iPhone 17.
For those keeping their watches for a long time, end of support is pretty clearly tied to processor generation. So we’ll expect Series 6/7/8 will all lose support together, followed by Series 9/10/11.
Upgrading every 3 generations seems to really be where the bang for buck is.