Determine what depends on the vendor
Local Matter or bridge control may outlive some cloud features, but this depends on the product.
Replace by consequence
Prioritize unsupported devices that handle access, cameras or important household functions.
Remove accounts and data
Follow manufacturer instructions when retiring a device.
Do not create unnecessary e-waste
A supported local device does not need replacement merely because a newer model exists.
Keep in mind. Compatibility is not permanent. Confirm the current manufacturer, platform and certification information before purchasing, resetting or migrating a device.