Apple now no longer offers users to upgrade Home architecture in iOS 16.2. This follows several reports claiming that home is stuck in upgrading state and couple of other issues including inability to invite residents and some accessory problems.
Existing users who already upgraded the architecture do not have an option to downgrade.
Developer:Investigate, if changes affect how HomeKit apps work.
QA engineer:Be aware of existing issues during the testing.
PM/DM:Communicate issues properly to users in case of complaints.