iOS 16.4 beta introduces the ability to update the HomeKit architecture. Previously, this could be done in iOS 16.2, but Apple disabled this feature because after the update, many smart devices stopped working, and it turned out that they appeared unexpectedly.
In iOS 16.4, the company has fixed all issues related to updating the HomeKit architecture. This update is optional. Apple claims that the new architecture improves the efficiency of smart devices.
iOS 16.4 reintroduces the new HomeKit architecture that was removed due to multiple issues
When iOS 16 was announced, Apple mentioned that it would introduce a new architecture for the Home app to expand the use of HomeKit accessories. This feature was officially released in iOS 16.2, but Apple quickly removed it from the system after numerous reports that the new architecture was causing compatibility issues with smart devices. [?]
9to5mac.com
Source: Iphones RU

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