I accepted the new architecture in December. I have an Apple TV 4K acting as my Home hub that gave me trouble* starting when it upgraded to tvOS 16.3.1 and/or 16.3.2. My HomeKit problems cleared up with 16.4.
* Problems were with remote access for certain devices and lasted for nearly two months. Oddly, I could clear up the problems by rebooting my router and Apple TV, but that only lasted until the next day. Maintaining remote access to certain devices and certain automations meant daily rebooting.