https://support.apple.com/guide/iphone/set-up-a-focus-iphd62...
Having my phone ring at home and vibrate when away is the most obvious use case for this feature, and yet it can't be implemented because you can't toggle a physical switch in hardware.
I know the latest generation iPhones don't have those, and I think that's the right decision, but it's still disappointing for older-gen users.