Thanks for your interest in the Aqara Hub M3 and for bringing up the Thread spec version!
Currently, the M3 Hub supports Thread 1.3, which already includes many key improvements such as enhanced backbone connectivity, and better interoperability with multi-border router networks. We’re aware of the new features introduced in Thread 1.4, and our team is actively evaluating that version as part of our future update roadmap.
We truly appreciate your feedback—it helps us prioritize what matters most to our users.