It could be 2026 before all your Thread border routers work together
Briefly

Thread 1.4, set to launch with Apple's tvOS 26 this fall, addresses the issue of fragmented Thread networks in smart homes by enabling border routers to integrate into existing networks. While Apple is progressing with this update, Google and Amazon are still operating on Thread 1.3, which means consumers with mixed-brand setups will have to wait for greater compatibility, expected by 2026. This protocol is crucial for IoT devices to communicate effectively within smart homes, providing a streamlined user experience.
"In a fragmented smart home landscape, Thread 1.4 is designed to unify connectivity by allowing multiple border routers to join the same network, rather than create separate ones."
"With Apple releasing Thread 1.4 in tvOS 26 this fall, patience will be needed as Google and Amazon are still on the previous version, delaying a seamless integration for users."
Read at The Verge
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