Sony has made various hardware chagnes between the WH-1000XM5 and WH-1000XM6. As a new teardown video highlights, the WH-1000XM6 is more repairable than its predecessors, albeit with a 12.5% smaller battery in place. Added repairability means nothing when Sony does not sell spare parts, though.https://www.notebookcheck.net/Sony-WH-1000XM6-New-wireless-over-ear-headphones-shine-with-better-repairability-than-older-WH-1000XM5.1027432.0.html
Someone non-Sony will make some profit of its repairability.